Clinical Approach to Back Pain

Pediatric Population (0-18 years)

1
Symptom Overview
Overview
2
Pathophysiology
Mechanism
3
History Taking
History
4
Physical Examination
Examination
5
Differential Diagnosis
Differential
6
Investigations
Workup
7
Clinical Decision-Making
Algorithm
8
Pearls and Pitfalls
Summary

1. Symptom Overview

Understanding the clinical significance and classification of back pain in children and adolescents

Back pain in children and adolescents was historically considered rare, but recent studies show it is more common than previously believed, affecting approximately 20-30% of children by adolescence. Unlike adults, where back pain is often nonspecific and self-limiting, pediatric back pain warrants careful evaluation because an identifiable cause is found in up to 50% of cases. The prevalence increases with age, rising from approximately 1% in children under 7 years to over 30% in adolescents aged 15-18 years. Back pain accounts for approximately 2% of pediatric outpatient visits and represents an important diagnostic challenge due to the broad differential diagnosis spanning mechanical, inflammatory, infectious, neoplastic, and developmental etiologies.

Definition

Back pain is defined as pain or discomfort localized to the spinal region, including the cervical, thoracic, lumbar, or sacral areas. In pediatric patients, back pain represents a symptom that requires systematic evaluation, as the likelihood of identifying a specific underlying cause is significantly higher than in adults. The developing spine, ongoing skeletal maturation, and age-specific pathologies necessitate a distinct diagnostic approach compared to adult back pain evaluation.

Key Epidemiology

Lifetime prevalence by age 18: 20-70% (varies by study methodology)
Point prevalence in adolescents: 15-20%
Identifiable cause found: Up to 50% of cases (compared to approximately 15% in adults)
Peak age of presentation: 13-15 years
Male to female ratio: Varies by etiology; spondylolysis more common in males, scoliosis-related pain more common in females
Red flag findings present: 5-10% of children presenting with back pain

Classification by Duration

Duration of symptoms guides the diagnostic approach and helps narrow the differential diagnosis. Unlike adults where chronic back pain definitions extend to 12 weeks, pediatric thresholds are generally shorter given the higher likelihood of specific pathology.

Category	Duration	Common Causes	Clinical Significance
Acute	Less than 2 weeks	Muscle strain, trauma, viral myositis, early discitis	Most resolve spontaneously; evaluate for red flags and recent trauma. Persistent symptoms warrant reassessment.
Subacute	2 to 6 weeks	Spondylolysis, discitis, apophysitis, herniated disc, early tumor	Higher suspicion for structural pathology; imaging often indicated if symptoms persist beyond 2-4 weeks.
Chronic	Greater than 6 weeks	Spondylolisthesis, Scheuermann disease, tumor, inflammatory conditions, functional pain	Comprehensive workup required; psychological factors increasingly relevant. Higher likelihood of serious pathology compared to adults.

Classification by Location

The anatomical location of back pain provides important diagnostic clues, as certain conditions have predilection for specific spinal regions.

Cervical Spine Pain

Prevalence: Less common than lumbar; approximately 5-10% of pediatric back pain

Common causes: Torticollis, atlantoaxial instability (especially in Down syndrome), cervical disc disease, muscle strain, juvenile idiopathic arthritis

Red flags: Neurological symptoms, trauma history, systemic symptoms

Thoracic Spine Pain

Prevalence: Less common; approximately 10-15% of pediatric back pain

Common causes: Scheuermann disease, scoliosis, vertebral osteomyelitis, tumor, disc herniation (rare)

Red flags: Thoracic pain in young children is more concerning; higher association with serious pathology

Lumbar Spine Pain

Prevalence: Most common location; 60-70% of pediatric back pain

Common causes: Spondylolysis, spondylolisthesis, muscle strain, disc herniation, mechanical overuse

Red flags: Radicular symptoms, bowel or bladder dysfunction, progressive neurological deficits

Sacral and Sacroiliac Pain

Prevalence: Approximately 10-15% of pediatric back pain

Common causes: Sacroiliitis (juvenile spondyloarthropathy), sacral fractures, tumors

Red flags: Morning stiffness greater than 30 minutes, alternating buttock pain, enthesitis suggesting inflammatory etiology

Classification by Character

Pain Character	Description	Associated Conditions
Mechanical Pain	Worsens with activity, improves with rest; related to movement and loading	Spondylolysis, muscle strain, disc herniation, spondylolisthesis
Inflammatory Pain	Morning stiffness greater than 30 minutes, improves with activity, worse with rest	Juvenile spondyloarthropathy, sacroiliitis, juvenile idiopathic arthritis
Radicular Pain	Shooting pain following dermatomal distribution; may include numbness or weakness	Disc herniation, tumor with nerve compression, tethered cord
Constant Pain	Unremitting pain not relieved by rest or position change; may include night pain	Tumor, infection (discitis, osteomyelitis), inflammatory conditions
Night Pain	Pain that awakens the child from sleep or is worse at night	Osteoid osteoma (classically relieved by nonsteroidal anti-inflammatory drugs), malignancy, infection

Classification by Age Group

Age is a critical factor in pediatric back pain evaluation, as the differential diagnosis varies significantly across developmental stages.

Age Group	Common Causes	Special Considerations
Infants and Toddlers (0-3 years)	Discitis, vertebral osteomyelitis, congenital anomalies, tumor (neuroblastoma), spinal dysraphism	Back pain is rare and always concerning; may present as irritability, refusal to walk, or loss of milestones. High suspicion for serious pathology required.
Early Childhood (4-10 years)	Discitis, vertebral osteomyelitis, tumor (leukemia, Ewing sarcoma), spondylolysis, Scheuermann disease (late)	Still relatively uncommon; identifiable cause found in majority. Inflammatory and infectious causes more prevalent. Psychogenic pain less common.
Adolescents (11-18 years)	Spondylolysis, spondylolisthesis, Scheuermann disease, disc herniation, muscle strain, overuse injuries, scoliosis-related pain	Most common age for presentation; mechanical causes predominate. Athletic participation is significant risk factor. Psychological factors become increasingly relevant.

Pattern and Timing Classification

Pattern	Description	Suggests
Activity-related	Pain during or after sports, physical activity, or heavy backpack use	Spondylolysis, muscle strain, overuse injury, apophysitis
Morning stiffness	Stiffness and pain upon waking that improves with movement	Inflammatory spondyloarthropathy, juvenile idiopathic arthritis
Night pain	Pain that awakens from sleep or is exclusively nocturnal	Osteoid osteoma (classic), malignancy, infection
Position-dependent	Relief with specific positions (flexion or extension)	Spondylolisthesis (relief with flexion), disc herniation, spinal stenosis
Progressive	Worsening over time despite conservative management	Tumor, infection, progressive deformity, inflammatory condition
Intermittent	Episodes of pain with pain-free intervals	Mechanical causes, spondylolysis, functional pain

Key Clinical Concept: Unlike adults where nonspecific low back pain accounts for approximately 85% of cases, pediatric back pain has an identifiable cause in up to 50% of cases. The younger the child presenting with back pain, the higher the likelihood of serious underlying pathology. A systematic approach with thorough history, physical examination, and targeted investigations is essential. Remember: “Back pain in a young child is guilty until proven innocent.”

Impact on Quality of Life

Pediatric back pain can significantly affect multiple domains of a child’s life:

Academic performance: School absenteeism, difficulty sitting for prolonged periods, inability to participate in physical education
Sports participation: Limitation or cessation of athletic activities, which may have psychological and social consequences
Sleep quality: Night pain leading to sleep disturbance and daytime fatigue
Psychological well-being: Anxiety, depression, and fear-avoidance behaviors, particularly in chronic pain
Social functioning: Reduced peer interaction and recreational activities

2. Pathophysiology and Mechanisms

Understanding the underlying mechanisms of back pain in the pediatric spine

Understanding the pathophysiology of pediatric back pain requires knowledge of the developing spine’s unique anatomy and biomechanics. The pediatric spine differs fundamentally from the adult spine in its ossification patterns, cartilaginous composition, ligamentous laxity, and response to mechanical loading. These developmental differences explain why certain conditions (such as spondylolysis and Scheuermann disease) are unique to or more prevalent in the pediatric population, while others (such as degenerative disc disease) are rare in children.

The Developing Spine: Key Anatomical Considerations

Feature	Pediatric Spine	Adult Spine	Clinical Relevance
Ossification	Incomplete; secondary ossification centers (ring apophyses) fuse in late adolescence	Complete ossification	Apophyseal injuries and avulsions can occur; growth plates are vulnerable to repetitive stress
Cartilaginous Content	Higher proportion of cartilage; endplates are cartilaginous	Predominantly osseous	More susceptible to Scheuermann disease and endplate changes; less prone to true disc herniation
Ligamentous Laxity	Greater ligamentous laxity and flexibility	Less ligamentous laxity	Greater range of motion but increased susceptibility to instability; higher cervical spine injuries occur at different levels than adults
Disc Composition	Higher water content; more resilient nucleus pulposus	Decreased water content with age	True disc herniation is less common in children; when present, often associated with trauma or Scheuermann disease
Pars Interarticularis	Weaker; still ossifying during adolescence	Fully ossified	Vulnerable to stress fractures (spondylolysis), especially with repetitive hyperextension

Pain Pathways in the Spine

Component	Structure	Function in Pain Generation
Pain Receptors (Nociceptors)	Present in: outer annulus fibrosus, posterior longitudinal ligament, facet joint capsules, vertebral endplates, paraspinal muscles, dura mater	Detect mechanical, thermal, and chemical stimuli; absent in inner disc and nucleus pulposus
Afferent Pathway	Dorsal rami (posterior elements), sinuvertebral nerve (disc, posterior longitudinal ligament), gray rami communicantes (anterior elements)	Transmit nociceptive signals to the dorsal horn of the spinal cord
Spinal Cord Processing	Dorsal horn, ascending spinothalamic and spinoreticular tracts	Modulation and relay of pain signals; central sensitization can occur in chronic pain
Central Processing	Thalamus, somatosensory cortex, limbic system	Pain perception, localization, and emotional component; particularly relevant in chronic pediatric pain
Descending Modulation	Periaqueductal gray, rostral ventromedial medulla	Inhibitory pathways that modulate pain perception; may be immature or altered in chronic pain states

Mechanisms of Pain by Structure

Osseous Structures

Pain generators: Vertebral body, pars interarticularis, pedicles, facet joints

Mechanism: Periosteal nociceptor activation, microfractures, bone marrow edema, tumor infiltration, infection

Clinical relevance: Night pain suggests osseous pathology; bone scan sensitivity for stress fractures

Intervertebral Disc

Pain generators: Outer annulus fibrosus, adjacent endplates

Mechanism: Annular tears, endplate changes (Scheuermann disease), disc herniation with nerve root compression or chemical irritation

Clinical relevance: True discogenic pain rare in children; when present, often trauma-related

Neural Structures

Pain generators: Nerve roots, dorsal root ganglia, spinal cord, dura

Mechanism: Mechanical compression, ischemia, chemical irritation from inflammatory mediators

Clinical relevance: Radicular symptoms, tethered cord, intraspinal tumors

Mechanism of Pain by Condition

Condition	Mechanism	Clinical Correlation
Spondylolysis	Stress fracture of the pars interarticularis due to repetitive hyperextension and rotation; genetic predisposition with thin pars; fatigue failure of bone under cyclic loading exceeding repair capacity	Pain with extension activities; common in athletes (gymnastics, football, diving); may progress to spondylolisthesis if bilateral
Spondylolisthesis	Forward slippage of vertebra (usually L5 on S1) due to bilateral pars defects; mechanical instability, facet joint degeneration, and potential neural compression	Hamstring tightness (protective spasm), palpable step-off; higher grades may cause radiculopathy or cauda equina syndrome
Scheuermann Disease	Osteochondrosis of vertebral endplates; weakened endplates allow disc material to herniate into vertebral body (Schmorl nodes); anterior wedging of vertebrae due to growth disturbance	Thoracic kyphosis greater than 45 degrees; pain localized to apex of kyphosis; worse with prolonged sitting
Discitis	Bacterial infection (usually Staphylococcus aureus) of the disc space; hematogenous spread via vertebral endplate vessels (more vascular in children); inflammatory response causes disc destruction	Younger children (under 5 years most common); refusal to walk, sit, or bend; may have low-grade fever; elevated inflammatory markers
Vertebral Osteomyelitis	Hematogenous seeding of vertebral body; metaphyseal equivalent blood supply in children; abscess formation, bone destruction, potential epidural extension	More systemic symptoms than discitis; point tenderness; may present with neurological deficits if epidural abscess forms
Osteoid Osteoma	Benign bone tumor with central nidus producing prostaglandins (particularly prostaglandin E2); intense inflammatory response causes pain; nidus surrounded by reactive bone formation	Classic nocturnal pain relieved by nonsteroidal anti-inflammatory drugs (inhibit prostaglandin synthesis); scoliosis if located in posterior elements
Juvenile Spondyloarthropathy	Enthesitis and inflammation at ligament/tendon insertions; sacroiliitis with inflammatory cell infiltration; genetic association with HLA-B27; cytokine-mediated inflammation	Inflammatory back pain pattern; enthesitis at other sites; uveitis, inflammatory bowel disease associations; responds to anti-inflammatory therapy
Disc Herniation	Displacement of nucleus pulposus through annular defect; mechanical compression of nerve root and/or chemical irritation from inflammatory mediators released from disc material	Less common in children than adults; when present, often associated with trauma or apophyseal ring fracture; radicular symptoms in dermatomal distribution
Muscle Strain	Microtrauma to paraspinal muscles; inflammatory response with release of pain-producing substances; muscle spasm as protective mechanism	Most common cause of acute back pain; localized tenderness; resolves with rest and conservative management
Spinal Cord Tumor	Direct compression of spinal cord or nerve roots; infiltration of pain-sensitive structures; may cause cord ischemia	Progressive neurological deficits; night pain; may have subtle gait changes or regression of motor milestones in young children

Often Overlooked Mechanism: The Painful Scoliosis

Adolescent idiopathic scoliosis itself is typically painless. When a child with scoliosis presents with significant back pain, the scoliosis should not be assumed to be the cause. Painful scoliosis should prompt investigation for an underlying cause such as osteoid osteoma (which can cause secondary scoliosis due to muscle spasm), syringomyelia, spinal cord tumor, or other spinal pathology. The adage “scoliosis doesn’t hurt” should prompt further workup when pain is a prominent feature.

Growth-Related Vulnerability

The pediatric spine is particularly vulnerable during periods of rapid growth due to:

Growth plate susceptibility: The ring apophyses (secondary ossification centers) are vulnerable to injury from repetitive loading, leading to apophyseal fractures or Schmorl node formation
Muscle-bone mismatch: Rapid bone growth may outpace muscle and tendon adaptation, creating biomechanical imbalances
Increased activity demands: Sports participation during growth spurts places additional stress on the developing spine
Incomplete ossification: The pars interarticularis remains vulnerable to stress fracture until full ossification in late adolescence

Central Sensitization in Chronic Pediatric Back Pain

Understanding Chronic Pain in Children

When pediatric back pain becomes chronic, neuroplastic changes in the central nervous system can amplify and perpetuate pain independent of the original tissue injury. This central sensitization involves:

Dorsal horn hyperexcitability: Lower threshold for pain signal transmission
Expanded receptive fields: Pain perceived over larger areas than original injury
Allodynia: Pain from normally non-painful stimuli
Psychological amplification: Fear-avoidance behaviors, catastrophizing, and anxiety can intensify pain perception

Recognition of central sensitization is crucial as it requires a multimodal treatment approach beyond addressing peripheral pain generators.

Referred Pain Patterns

Understanding referred pain is essential in localizing the source of spinal pathology:

Spinal Level	Referred Pain Location	Associated Dermatome
Cervical (C5-C7)	Shoulder, arm, scapular region	C5: lateral arm; C6: thumb; C7: middle finger
Thoracic	Chest wall, abdominal wall (can mimic visceral pain)	T4: nipple line; T10: umbilicus
Upper Lumbar (L1-L3)	Groin, anterior thigh	L2: anterior thigh; L3: knee
Lower Lumbar (L4-S1)	Posterior thigh, leg, foot	L4: medial leg; L5: dorsum of foot; S1: lateral foot
Sacroiliac	Buttock, posterior thigh (may mimic radiculopathy)	Not dermatomal; typically above knee

Summary: Why Understanding Mechanism Matters

Clinical Application of Pathophysiology:

Mechanical pain (worse with activity): Suggests spondylolysis, spondylolisthesis, muscle strain, or disc pathology — imaging and activity modification are key
Inflammatory pain (morning stiffness, improves with activity): Suggests juvenile spondyloarthropathy — check inflammatory markers, HLA-B27, consider MRI of sacroiliac joints
Night pain relieved by nonsteroidal anti-inflammatory drugs: Classic for osteoid osteoma — thin-slice CT to identify nidus
Constant, progressive pain: Suggests tumor or infection — requires urgent workup with imaging and laboratory studies
Radicular pattern: Suggests nerve root involvement — MRI to evaluate disc, tumor, or other compressive lesion

3. History Taking

A comprehensive approach to eliciting the back pain history in children and adolescents

Red Flags — Require Urgent Evaluation

Age less than 4 years — Back pain is rare and concerning at this age; high likelihood of serious pathology
Night pain awakening from sleep — Suggests tumor (especially osteoid osteoma) or infection
Constant, unremitting pain — Not relieved by rest or position change; suggests tumor or infection
Systemic symptoms — Fever, weight loss, malaise suggest infection or malignancy
Neurological symptoms — Weakness, numbness, bowel or bladder dysfunction suggest cord or root compression

Gait abnormality — New limp, refusal to walk, or regression of motor milestones
Progressive symptoms — Worsening despite conservative management over 4 weeks
Point tenderness over vertebra — Suggests fracture, infection, or tumor
Morning stiffness greater than 30 minutes — Inflammatory pattern suggesting spondyloarthropathy
History of malignancy — Must consider spinal metastasis or recurrence
Immunocompromised state — Higher risk of spinal infection

Pediatric History: Key Principles

In pediatric back pain evaluation, history should be obtained from both the child and the caregiver. Young children may have difficulty localizing or describing pain, making caregiver observations crucial. Adolescents should be given opportunity for private discussion, particularly regarding psychological factors, substance use, or concerns they may not share in front of parents. Remember that back pain in young children (under 10 years) has a higher likelihood of serious underlying pathology.

Systematic History: The “SPINE ACHES” Approach

Use the mnemonic “SPINE ACHES” to ensure comprehensive history taking for pediatric back pain:

S — Site and Severity: Where exactly is the pain? Ask the child to point with one finger. How severe is the pain (use age-appropriate pain scale)?
P — Pattern and Progression: Is pain constant or intermittent? Getting better, worse, or staying the same? Mechanical versus inflammatory pattern?
I — Impact on function: School attendance? Sports participation? Sleep? Activities of daily living? Walking and mobility?
N — Neurological symptoms: Any weakness, numbness, tingling, or bowel/bladder changes? Gait problems?
E — Exacerbating and relieving factors: What makes it worse (activity, rest, positions)? What makes it better (rest, medications, heat)?
A — Activity and Athletics: Sports participation? Recent increase in training? Type of sport (hyperextension sports)? Heavy backpack use?
C — Constitutional symptoms: Fever, weight loss, night sweats, fatigue, loss of appetite?
H — History (medical, developmental, family): Past medical problems? Birth and developmental history? Family history of spondyloarthropathy, autoimmune disease, or spinal problems?
E — Emotional and psychological factors: School stress? Anxiety? Depression? Secondary gain? Family dynamics?
S — Start and circumstances: When did it start? Any trauma or inciting event? Acute onset versus gradual?

Targeted Questions by Suspected Cause

Suspected Cause	Key Features	Ask This Question
Spondylolysis or Spondylolisthesis	Adolescent athlete, hyperextension sports, lumbar pain with extension	“Does the pain get worse when you bend backward or arch your back? What sports do you play — gymnastics, football, diving, or dance?”
Scheuermann Disease	Adolescent with thoracic kyphosis, pain at apex of curve, worse with sitting	“Have you noticed any rounding of your upper back? Does the pain get worse when you sit for a long time at school?”
Discitis or Vertebral Osteomyelitis	Young child, refusal to walk or sit, fever, recent infection	“Has your child stopped wanting to walk or sit up? Have they had any fevers or recent infections? Any recent procedures or hospitalizations?”
Osteoid Osteoma	Night pain relieved by nonsteroidal anti-inflammatory drugs, may have scoliosis	“Does the pain wake you up at night? Does ibuprofen or naproxen take the pain away completely? Have you noticed any curve in the spine?”
Juvenile Spondyloarthropathy	Morning stiffness, inflammatory pattern, enthesitis, family history	“Is the pain and stiffness worse in the morning when you first wake up? Does moving around make it feel better? Does anyone in your family have psoriasis, inflammatory bowel disease, or back problems?”
Disc Herniation	Radicular pain, worse with sitting or Valsalva, dermatomal symptoms	“Does the pain shoot down into your leg? Does it get worse when you cough, sneeze, or strain? Do you have any numbness or tingling in your legs or feet?”
Spinal Tumor	Progressive pain, night pain, neurological symptoms, constitutional symptoms	“Is the pain getting worse over time? Does it wake you up at night? Have you lost weight or felt more tired than usual? Any weakness or changes in walking?”
Muscle Strain	Acute onset with activity, localized, improves with rest	“Did the pain start suddenly during an activity? Can you point to exactly where it hurts? Does rest make it better?”
Functional or Psychogenic Pain	Inconsistent symptoms, multiple somatic complaints, school avoidance, stressors	“How is school going? Any stressors at home or with friends? Do you have any other pains or symptoms? How does the pain affect what you can do?”

Pediatric-Specific History Components

Birth and Early Development History

Gestational age and birth weight: Prematurity may be associated with spinal abnormalities
Birth complications: Birth trauma, breech presentation
Neonatal course: NICU admission, mechanical ventilation
Congenital anomalies: Any known spinal or other anomalies
Developmental milestones: Particularly motor milestones — when did they walk? Any regression?

Growth and Development

Growth trajectory: Height and weight trends; recent growth spurt?
Pubertal development: Tanner staging; growth spurt timing relevant for spondylolysis, Scheuermann
Gross motor function: Current activity level, any decline
Fine motor function: If cervical involvement suspected
Bowel and bladder function: Any incontinence (suggests cord involvement)

Activity and Sports History

Current sports participation: Type, frequency, intensity
High-risk sports: Gymnastics, football, dance, wrestling, diving, weightlifting, rowing
Recent changes: New sport, increased training, competition season
Technique issues: Coach concerns about form
Backpack use: Weight, carrying method, duration

School and Psychosocial History

School attendance: Days missed due to pain
Academic performance: Any recent changes
Social relationships: Friends, peer interactions
Home environment: Stressors, family dynamics
Mental health: Anxiety, depression, previous psychiatric history
Sleep: Quality, duration, relationship to pain

Family History

Family History Item	Associated Conditions	Clinical Relevance
Ankylosing spondylitis or inflammatory back pain	Juvenile spondyloarthropathy	First-degree relative with ankylosing spondylitis increases risk 10-20 fold
Psoriasis	Psoriatic arthritis, spondyloarthropathy	May present with back pain before skin manifestations
Inflammatory bowel disease	Enteropathic arthritis, sacroiliitis	Back pain may precede gastrointestinal symptoms
Scoliosis	Adolescent idiopathic scoliosis	Genetic component; screen siblings
Connective tissue disorders	Marfan syndrome, Ehlers-Danlos syndrome	May have associated spinal pathology
Chronic pain syndromes	Fibromyalgia, chronic back pain	May suggest familial pain amplification or learned pain behaviors

Medication and Treatment History

Current and Previous Treatments

Analgesics tried: Paracetamol, nonsteroidal anti-inflammatory drugs (ibuprofen, naproxen) — response?
Response to nonsteroidal anti-inflammatory drugs: Complete relief suggests osteoid osteoma; good response suggests inflammatory component
Physical therapy: Previous courses, response, compliance
Bracing: Previous use for scoliosis or spondylolisthesis
Activity modification: Rest from sports, response
Complementary therapies: Chiropractic, massage, acupuncture

Medications That May Cause Back Pain

Corticosteroids: Vertebral compression fractures with long-term use (asthma, inflammatory conditions)
Fluoroquinolones: Tendinopathy (though spinal involvement rare)
Isotretinoin: Diffuse idiopathic skeletal hyperostosis-like changes, back pain
Chemotherapy: Vertebral avascular necrosis, vertebral fractures
Anticonvulsants: Osteomalacia with chronic use

Review of Systems

A thorough review of systems helps identify systemic causes and associated conditions:

System	Symptoms to Ask About	Associated Conditions
Constitutional	Fever, weight loss, fatigue, night sweats, loss of appetite	Infection, malignancy, inflammatory conditions
Musculoskeletal	Joint pain or swelling, morning stiffness, enthesitis (heel pain)	Juvenile idiopathic arthritis, spondyloarthropathy
Neurological	Weakness, numbness, tingling, bowel or bladder changes, headaches	Disc herniation, tumor, tethered cord, Chiari malformation
Gastrointestinal	Abdominal pain, diarrhea (bloody?), constipation	Inflammatory bowel disease with spondyloarthropathy; referred pain
Genitourinary	Dysuria, urinary frequency, incontinence, menstrual history	Urinary tract infection (referred pain), cauda equina syndrome
Skin	Rashes, psoriasis, nail changes	Psoriatic arthritis, reactive arthritis
Eyes	Red eyes, eye pain, photophobia, blurred vision	Uveitis (associated with spondyloarthropathy and juvenile idiopathic arthritis)

Clinical Pearl: The Private Adolescent Interview

Always create an opportunity to speak with the adolescent alone. Important information that may emerge includes: true impact of pain on daily life, school avoidance behaviors, substance use (which may mask pain or contribute to risk-taking activities), mental health concerns (anxiety, depression), relationship issues, and concerns they may not voice in front of parents. This also establishes trust and allows assessment of the adolescent’s own understanding of their condition.

4. Physical Examination

A systematic approach to examining the pediatric patient with back pain

Systematic Framework: Use a structured approach moving from observation → gait → standing examination → seated examination → supine examination → prone examination → neurological examination. Examining the child in their underwear is essential for adequate visualization of the spine. Build rapport before the examination, especially with younger children, and explain each step.

General Observation

Begin with careful observation before touching the patient:

General appearance: Comfortable or in distress? Facial expression? Guarding behaviors?
Posture: Standing posture, sitting posture, antalgic positioning
Movement: How do they move around the room? Getting on and off the examination table?
Growth and development: General assessment of nutritional status, height, body habitus
Skin: Café-au-lait spots (neurofibromatosis), midline skin lesions (spinal dysraphism), psoriatic plaques
Affect and behavior: Anxious? Depressed? Pain behaviors?

Vital Signs

Age Group	Heart Rate (bpm)	Respiratory Rate (/min)	Systolic Blood Pressure (mmHg)	Temperature
Infant (0-12 months)	100-160	30-60	70-90	36.5-37.5°C
Toddler (1-3 years)	90-150	24-40	80-100	36.5-37.5°C
Preschool (3-5 years)	80-140	22-34	85-105	36.5-37.5°C
School age (6-12 years)	70-120	18-30	90-110	36.5-37.5°C
Adolescent (13-18 years)	60-100	12-20	100-120	36.5-37.5°C

Vital Sign Significance in Back Pain

Fever: Suggests infection (discitis, osteomyelitis, epidural abscess) or inflammatory condition
Tachycardia: May indicate pain, fever, anemia (malignancy), or anxiety
Hypertension: Can be seen with severe pain; in young children, consider renal causes with referred back pain

Growth Parameters

Essential in pediatric examination — plot on appropriate growth charts:

Height: Short stature may indicate skeletal dysplasia or chronic illness
Weight: Weight loss is a red flag; obesity may contribute to mechanical back pain
Body mass index: Plot on percentile charts
Height velocity: Important for timing of scoliosis progression risk
Arm span: Compare to height for suspected Marfan syndrome or skeletal dysplasia

Gait Assessment

Gait Abnormality	Description	Associated Conditions
Antalgic gait	Shortened stance phase on affected side to minimize pain	Any painful condition; discitis (toddler may refuse to walk)
Stiff or guarded gait	Reduced spinal motion, walks “like a board”	Discitis, muscle spasm, spondylolisthesis
Trendelenburg gait	Pelvis drops on contralateral side during stance phase	Hip pathology (may present as back pain), L5 weakness
Foot drop	Inability to dorsiflex foot; steppage gait	L5 radiculopathy, peroneal nerve injury
Toe walking	Walking on toes persistently	Tight heel cords, tethered cord, spastic diplegia
Waddling gait	Side-to-side trunk movement with each step	Bilateral hip pathology, muscular dystrophy, severe spondylolisthesis

Also observe:

Heel walking: Tests L4-L5 (ankle dorsiflexors)
Toe walking: Tests S1 (gastrocnemius-soleus)
Tandem gait: Tests balance and coordination
Running: May accentuate subtle gait abnormalities

Standing Examination

Inspection (Posterior View)

Shoulder height symmetry: Asymmetry may indicate scoliosis
Scapular position: Prominence or asymmetry
Waist crease symmetry: Asymmetric waist creases suggest scoliosis
Paraspinal muscle bulk: Asymmetry, spasm, atrophy
Midline skin: Dimples, hair tufts, lipomas, hemangiomas (markers of spinal dysraphism)
Iliac crest height: Leg length discrepancy
Gluteal folds: Symmetry

Inspection (Lateral View)

Cervical lordosis: Normal, increased, or decreased
Thoracic kyphosis: Normal 20-40 degrees; increased in Scheuermann disease
Lumbar lordosis: Hyperlordosis may indicate spondylolisthesis; loss of lordosis suggests muscle spasm
Sagittal balance: Plumb line from C7 should fall through S1

Adams Forward Bend Test

Performing the Adams Test

With the patient standing with feet together, arms hanging freely, ask them to bend forward at the waist with knees straight, letting the arms hang down.

Observe from behind: Rib hump (thoracic) or paraspinal prominence (lumbar) indicates structural scoliosis
Use a scoliometer: Angle of trunk rotation greater than 5-7 degrees warrants radiographic evaluation
Positive test: Asymmetric rotation suggests structural scoliosis requiring imaging

Note: Pain or inability to perform forward flexion is also clinically significant and may indicate muscle spasm, discitis, or disc pathology.

Range of Motion (Standing)

Movement	Normal Range	Pain Suggests
Flexion	Touch toes (Schober test: greater than 5 cm expansion)	Disc pathology, muscle strain, spondylolisthesis (may be painless)
Extension	30 degrees	Spondylolysis, spondylolisthesis, facet joint pathology
Lateral flexion	30 degrees each side	Muscle spasm, facet pathology; asymmetric limitation suggests structural pathology
Rotation	45 degrees each side	Facet pathology, muscle spasm

Special Standing Tests

Single leg hyperextension test (Stork test): Patient stands on one leg and hyperextends the spine. Pain on the stance leg side suggests ipsilateral spondylolysis. High sensitivity for pars defects.
Single leg stance: Tests hip abductor strength (Trendelenburg test) — if pelvis drops on opposite side, suggests hip pathology or L5 weakness

Seated Examination

Sitting posture: Can they sit upright? Slumped posture may indicate thoracic pain or Scheuermann disease
Slump test: Seated with thoracolumbar flexion, neck flexion, then knee extension — reproduces radicular pain if positive (neural tension sign)
Upper extremity neurological examination: If cervical spine involvement suspected

Supine Examination

Hip Examination

Hip pathology commonly presents as back or groin pain in children:

Range of motion: Flexion, extension, internal rotation (often first limited in hip pathology), external rotation, abduction, adduction
FABER test (Patrick’s test): Flexion, Abduction, External Rotation — pain may indicate hip or sacroiliac joint pathology
Log roll: Gentle internal and external rotation of the leg — pain suggests hip pathology

Straight Leg Raise (Lasègue’s Test)

Technique: With patient supine, passively raise extended leg by the heel
Positive test: Reproduction of radicular pain (not just hamstring tightness) at less than 60 degrees suggests L4-S1 nerve root irritation
Crossed straight leg raise: Pain in affected leg when opposite leg is raised — highly specific for disc herniation
Note: Straight leg raise is less sensitive in children compared to adults; hamstring tightness is common

Hamstring Tightness

Very common finding in pediatric back pain:

Popliteal angle: With hip flexed to 90 degrees, extend knee — angle less than 160 degrees indicates tightness
Significance: May be protective response to spondylolisthesis; also common in Scheuermann disease and general mechanical back pain

Abdominal Examination

Important to exclude referred pain from abdominal pathology:

Inspection: Distension, masses
Palpation: Tenderness, organomegaly, masses
Consider: Appendicitis, renal pathology, ovarian pathology in adolescent females

Prone Examination

Spinal Palpation

Spinous processes: Palpate each level for tenderness (point tenderness suggests fracture, infection, or tumor)
Step-off: Palpable step between spinous processes suggests spondylolisthesis (usually L5-S1)
Paraspinal muscles: Tenderness, spasm, asymmetry
Sacroiliac joints: Tenderness over posterior superior iliac spine area

Femoral Stretch Test

Technique: With patient prone, flex knee and extend hip
Positive test: Reproduction of anterior thigh or groin pain suggests upper lumbar (L2-L4) radiculopathy

Neurological Examination

Nerve Root	Motor Function	Sensory Distribution	Reflex
L2	Hip flexion (iliopsoas)	Anterior thigh	None reliable
L3	Knee extension (quadriceps)	Anterior knee	Patellar (diminished)
L4	Ankle dorsiflexion (tibialis anterior)	Medial leg and foot	Patellar
L5	Great toe extension (extensor hallucis longus), hip abduction	Lateral leg, dorsum of foot, first web space	None reliable (medial hamstring)
S1	Ankle plantarflexion (gastrocnemius), toe walking	Lateral foot, sole	Achilles

Upper Motor Neuron Signs (Suggest Cord Involvement)

Hyperreflexia: Increased deep tendon reflexes below level of lesion
Clonus: Sustained rhythmic contractions at ankle or patella
Babinski sign: Upgoing plantar response (normal in infants under 12 months)
Increased tone: Spasticity in lower limbs
Gait abnormalities: Spastic or scissoring gait

Signs of Cauda Equina Syndrome (Surgical Emergency)

Cauda Equina Syndrome — Requires Immediate Action

Saddle anesthesia: Numbness in perineal area
Bowel dysfunction: Incontinence or retention
Bladder dysfunction: Retention (most common), incontinence, or decreased sensation of bladder fullness
Bilateral lower extremity weakness: Progressive or severe
Sexual dysfunction: In adolescents

Action: Urgent MRI and neurosurgical consultation. Decompression within 48 hours improves outcomes.

Special Tests Summary

Test	Technique	Positive Finding	Suggests
Adams forward bend test	Forward flexion at waist, observe from behind	Rib hump or paraspinal prominence	Structural scoliosis
Stork test (single leg hyperextension)	Stand on one leg, hyperextend spine	Ipsilateral lumbar pain	Spondylolysis
Schober test	Mark 10 cm above and 5 cm below PSIS, measure expansion with flexion	Less than 5 cm expansion	Limited lumbar flexion (ankylosing spondylitis, muscle spasm)
FABER test	Flexion, Abduction, External Rotation of hip	Groin or back pain	Hip pathology or sacroiliac joint dysfunction
Straight leg raise	Passive leg raise with knee extended	Radicular pain less than 60 degrees	L4-S1 nerve root irritation (disc herniation)
Slump test	Seated flexion, neck flexion, knee extension	Reproduction of radicular symptoms	Neural tension (disc, tumor)
Femoral stretch test	Prone, flex knee and extend hip	Anterior thigh pain	Upper lumbar (L2-L4) radiculopathy
Gaenslen test	Supine, flex one hip while extending the other off table	Pain in sacroiliac region	Sacroiliac joint dysfunction

Examination Findings by Etiology

Condition	Key Examination Findings	Often Normal
Spondylolysis	Pain with extension, positive stork test, hamstring tightness, localized lumbar tenderness	Neurological examination, forward flexion may be painless
Spondylolisthesis	Palpable step-off (L5-S1), hamstring tightness, hyperlordosis, waddling gait (severe)	Neurological examination (unless severe)
Scheuermann disease	Increased thoracic kyphosis (does not correct with extension), tenderness at apex, hamstring tightness	Neurological examination
Discitis	Refusal to walk or sit, guarded gait, loss of lumbar lordosis, fever, point tenderness	Neurological examination (usually)
Disc herniation	Positive straight leg raise, radicular findings, asymmetric reflexes, dermatomal sensory changes	May have normal examination between episodes
Juvenile spondyloarthropathy	Limited Schober test, sacroiliac tenderness, enthesitis (Achilles, plantar fascia), reduced chest expansion	Early disease may have minimal findings
Osteoid osteoma	Scoliosis (if posterior element involvement), localized tenderness, may have paraspinal spasm	Neurological examination, general examination
Muscle strain	Localized paraspinal tenderness, muscle spasm, pain with movement, no neurological deficits	Neurological examination, special tests

Important Teaching Point: The Normal Examination

A normal physical examination does not exclude serious pathology in pediatric back pain. Many conditions — including early discitis, tumors, and inflammatory spondyloarthropathy — may present with minimal or no examination findings initially. The clinical history, particularly the pattern of pain, presence of red flags, and age of the child, should guide the decision to investigate further regardless of examination findings. Conversely, many children with benign mechanical back pain will have positive examination findings such as hamstring tightness and paraspinal tenderness.

5. Differential Diagnosis

Systematic approach organized by probability, age, duration, and clinical features

Key Principle: Pediatric Back Pain is Different

Unlike adults where 85% of back pain is “nonspecific,” pediatric back pain has an identifiable cause in up to 50% of cases. The younger the child, the higher the likelihood of serious pathology. A systematic approach considering age, duration, pain pattern, and red flags is essential. Remember: “Back pain in a young child is guilty until proven innocent.”

Acute Back Pain (Less than 2 weeks)

Probability	Condition	Key Features	Red Flags
COMMON (approximately 60-70%)	Muscle strain or sprain	Acute onset with activity, localized paraspinal tenderness, no neurological deficits, improves with rest	None typically; concern if no improvement in 1-2 weeks
COMMON	Viral myositis	Often follows viral illness, diffuse muscle pain, may have elevated creatine kinase	Severe weakness, myoglobinuria
LESS COMMON (approximately 20-30%)	Traumatic injury (contusion, fracture)	Clear history of trauma, localized tenderness, may have ecchymosis	Neurological deficits, high-energy mechanism
LESS COMMON	Early discitis or osteomyelitis	Young child (under 5 years), refusal to walk, fever, irritability	Fever, neurological symptoms, immunocompromised
UNCOMMON BUT SERIOUS (approximately 5-10%)	Vertebral fracture (pathological)	Minimal or no trauma, point tenderness, may have known malignancy or steroid use	History of malignancy, chronic steroid use, osteoporosis
UNCOMMON BUT SERIOUS	Epidural abscess	Fever, rapidly progressive pain, neurological deficits emerging	Fever, neurological deficits, immunocompromised, recent procedure
UNCOMMON BUT SERIOUS	Spinal cord or cauda equina compression	Acute neurological deficits, bowel or bladder dysfunction	Saddle anesthesia, urinary retention, bilateral weakness

Subacute Back Pain (2 to 6 weeks)

Probability	Condition	Key Features	Expected Course
COMMON (approximately 50%)	Spondylolysis (stress fracture of pars interarticularis)	Adolescent athlete, hyperextension sports, pain with extension, positive stork test	Improves with activity modification; may take 3-6 months for healing
COMMON	Mechanical overuse or postural pain	Related to heavy backpack, prolonged sitting, poor posture, no red flags	Improves with ergonomic modifications and physical therapy
LESS COMMON (approximately 30%)	Discitis	Young child (peak 2-4 years), refusal to walk or sit, loss of lordosis, elevated inflammatory markers	Responds to antibiotics over weeks; may have prolonged recovery
LESS COMMON	Vertebral osteomyelitis	Older child than discitis, more systemic symptoms, point tenderness, elevated inflammatory markers	Requires prolonged antibiotic therapy (4-6 weeks minimum)
LESS COMMON	Apophysitis or apophyseal avulsion	Adolescent during growth spurt, activity-related, localized tenderness over apophysis	Self-limiting; improves with rest over 4-8 weeks
UNCOMMON BUT SERIOUS (approximately 10-20%)	Spinal tumor (primary or metastatic)	Night pain, progressive symptoms, constitutional symptoms, neurological deficits	Progressive without treatment; requires urgent workup
UNCOMMON BUT SERIOUS	Juvenile spondyloarthropathy (early)	Morning stiffness greater than 30 minutes, inflammatory pattern, enthesitis, family history	Chronic relapsing course; responds to anti-inflammatory treatment

Chronic Back Pain (Greater than 6 weeks)

Step-by-Step Approach to Chronic Pediatric Back Pain:

Step 1: Assess for red flags — Age less than 4 years, night pain, constitutional symptoms, neurological deficits, progressive course
Step 2: Characterize the pain — Mechanical (worse with activity) versus inflammatory (morning stiffness, improves with activity)
Step 3: Consider age-appropriate diagnoses — Differential varies significantly by age group
Step 4: Evaluate for “The Pediatric Big Five” — Spondylolysis, spondylolisthesis, Scheuermann disease, disc pathology, inflammatory conditions
Step 5: Consider functional or psychogenic factors — Particularly in adolescents with multiple somatic complaints and normal investigations

Probability	Condition	Approximate Frequency	Key Distinguishing Features
COMMON	Spondylolysis	15-40% of adolescent back pain	Lumbar pain with extension, adolescent athlete (gymnastics, football, dance), positive stork test
COMMON	Spondylolisthesis	5-15%	May follow spondylolysis; palpable step-off, hamstring tightness, hyperlordosis
COMMON	Scheuermann disease	5-10%	Thoracic or thoracolumbar kyphosis greater than 45 degrees, rigid kyphosis, pain at apex
COMMON	Nonspecific mechanical back pain	20-30%	No identifiable structural cause, often postural, responds to conservative treatment
LESS COMMON	Disc herniation	3-5%	Radicular symptoms, positive straight leg raise, often post-traumatic in children
LESS COMMON	Juvenile spondyloarthropathy	5-10%	Inflammatory pattern, morning stiffness, enthesitis, HLA-B27 positive, sacroiliitis on imaging
LESS COMMON	Scoliosis-related pain	Variable	Scoliosis usually painless; pain should prompt search for underlying cause (tumor, syrinx)
LESS COMMON	Functional or psychogenic pain	10-20%	Inconsistent symptoms, multiple somatic complaints, school avoidance, stressors, normal investigations
UNCOMMON BUT SERIOUS	Osteoid osteoma	2-5%	Night pain relieved by nonsteroidal anti-inflammatory drugs, may cause scoliosis, small nidus on imaging
UNCOMMON BUT SERIOUS	Osteoblastoma	Less than 1%	Larger than osteoid osteoma, less responsive to nonsteroidal anti-inflammatory drugs, may cause neurological symptoms
UNCOMMON BUT SERIOUS	Ewing sarcoma	Less than 1%	Constitutional symptoms, lytic lesion on imaging, often presents late
UNCOMMON BUT SERIOUS	Spinal cord tumor (astrocytoma, ependymoma)	Less than 1%	Progressive neurological deficits, night pain, may have subtle gait changes
UNCOMMON BUT SERIOUS	Leukemia or lymphoma (spinal involvement)	Less than 1%	Constitutional symptoms, bone pain in multiple sites, abnormal blood counts
UNCOMMON BUT SERIOUS	Tethered cord syndrome	Less than 1%	Skin stigmata, progressive neurological symptoms, bowel or bladder dysfunction, foot deformities

Age-Based Differential Diagnosis

Age is a critical factor in narrowing the differential diagnosis. The likelihood of specific conditions varies significantly across developmental stages.

Age Group	Most Likely Causes	Must Not Miss	Clinical Pearl
Infants and Toddlers (0-3 years)	Discitis, vertebral osteomyelitis	Tumor (neuroblastoma, leukemia), spinal dysraphism, child abuse	Back pain is rare and always concerning at this age. Presentation may be nonspecific (irritability, refusal to walk). Serious pathology likely.
Early Childhood (4-10 years)	Discitis, osteomyelitis, spondylolysis (late), trauma	Tumor (Ewing sarcoma, leukemia, osteoid osteoma), infection	Still relatively uncommon; identifiable cause found in majority. Inflammatory and infectious causes remain prominent.
Early Adolescence (11-14 years)	Spondylolysis, spondylolisthesis, Scheuermann disease, mechanical or overuse	Tumor, inflammatory spondyloarthropathy, disc herniation	Peak incidence of spondylolysis. Growth spurt increases vulnerability to Scheuermann disease and apophyseal injuries.
Late Adolescence (15-18 years)	Spondylolysis, spondylolisthesis, disc herniation, mechanical, functional pain	Tumor, inflammatory spondyloarthropathy	Most common age for back pain presentation. Differential broadens to include adult-type conditions. Psychosocial factors increasingly relevant.

Anatomical Approach to Differential Diagnosis

Posterior Elements

Spondylolysis — Pars stress fracture

Spondylolisthesis — Vertebral slippage

Facet syndrome — Facet joint pathology

Osteoid osteoma — Often in posterior elements

Spinous process fracture — Trauma

Vertebral Body

Vertebral osteomyelitis — Infection

Scheuermann disease — Endplate osteochondrosis

Compression fracture — Trauma or pathological

Primary bone tumor — Ewing, osteosarcoma

Metastatic disease — Neuroblastoma, leukemia

Intervertebral Disc

Discitis — Disc space infection

Disc herniation — Nucleus pulposus displacement

Schmorl nodes — Endplate herniation

Apophyseal ring fracture — Trauma in adolescents

Soft Tissues and Neural

Muscle strain — Paraspinal muscles

Ligament sprain — Spinal ligaments

Spinal cord tumor — Astrocytoma, ependymoma

Tethered cord — Congenital anomaly

Syringomyelia — Spinal cord cavity

Mechanical versus Inflammatory Back Pain

Feature	Mechanical Pain	Inflammatory Pain
Morning stiffness	Minimal (less than 30 minutes)	Prolonged (greater than 30-60 minutes)
Effect of activity	Worsens with activity	Improves with activity
Effect of rest	Improves with rest	Worsens with rest
Night pain	Usually absent (except tumor)	May wake from sleep (second half of night)
Response to nonsteroidal anti-inflammatory drugs	Variable	Good response
Associated features	Activity-related injury	Enthesitis, uveitis, psoriasis, inflammatory bowel disease
Common conditions	Spondylolysis, disc herniation, muscle strain	Juvenile spondyloarthropathy, juvenile idiopathic arthritis

Tumors Causing Pediatric Back Pain

Tumor Type	Age Predilection	Location	Key Features
Osteoid osteoma	5-20 years	Posterior elements (pedicle, lamina)	Night pain relieved by nonsteroidal anti-inflammatory drugs, painful scoliosis, small nidus (less than 2 cm)
Osteoblastoma	10-25 years	Posterior elements	Larger than osteoid osteoma, less nonsteroidal anti-inflammatory drug responsive, may cause cord compression
Aneurysmal bone cyst	10-20 years	Posterior elements	Expansile lytic lesion, may cause pathological fracture
Ewing sarcoma	5-20 years	Vertebral body (sacrum common)	Constitutional symptoms, lytic lesion with soft tissue mass, permeative pattern
Osteosarcoma	10-20 years	Rare in spine	Aggressive bone destruction, soft tissue mass
Langerhans cell histiocytosis	1-15 years	Vertebral body	Classic “vertebra plana” (complete collapse), may be multifocal
Leukemia	2-10 years	Diffuse marrow involvement	Constitutional symptoms, multiple bone pain, abnormal blood counts
Neuroblastoma	Less than 5 years	Paraspinal with spinal extension	May cause cord compression, elevated urine catecholamines
Spinal cord astrocytoma	Any age	Intramedullary	Progressive neurological deficits, scoliosis, may have syrinx
Ependymoma	Adolescents and adults	Conus or filum terminale	Low back pain, radicular symptoms, may have subtle progression

Conditions Associated with Back Pain by System

System	Condition	Back Pain Mechanism
Rheumatological	Juvenile spondyloarthropathy, juvenile idiopathic arthritis, reactive arthritis	Sacroiliitis, enthesitis, inflammatory spinal involvement
Gastrointestinal	Inflammatory bowel disease (Crohn disease, ulcerative colitis)	Enteropathic arthritis, sacroiliitis (occurs in 10-20% of inflammatory bowel disease)
Renal	Pyelonephritis, nephrolithiasis, hydronephrosis	Referred pain to flank and back
Gynecological	Dysmenorrhea, endometriosis, ovarian pathology	Referred pain to lower back (consider in adolescent females)
Hematological	Sickle cell disease	Vertebral infarction, avascular necrosis
Connective tissue	Marfan syndrome, Ehlers-Danlos syndrome	Dural ectasia, spondylolisthesis, spinal instability

Quick Reference: “If You See This, Think This First”

Clinical Clue	Think This First	Next Step
Child under 4 years with back pain	Discitis, tumor, infection	Urgent workup: radiographs, inflammatory markers, consider MRI
Adolescent athlete with extension pain	Spondylolysis	Radiographs (including obliques); if negative and high suspicion, MRI or bone scan
Night pain relieved by ibuprofen	Osteoid osteoma	Thin-slice CT scan to identify nidus
Toddler refusing to walk or sit	Discitis	Inflammatory markers, spinal radiographs, MRI
Thoracic kyphosis with pain at apex	Scheuermann disease	Standing lateral radiograph of thoracic spine
Morning stiffness greater than 30 minutes	Juvenile spondyloarthropathy	Inflammatory markers, HLA-B27, MRI of sacroiliac joints
Palpable step-off at lumbosacral junction	Spondylolisthesis	Standing lateral radiograph of lumbar spine
Pain with radicular symptoms in adolescent	Disc herniation	MRI of lumbar spine
Painful scoliosis	Underlying pathology (osteoid osteoma, tumor, syrinx)	MRI of entire spine — scoliosis itself is typically painless
Progressive neurological deficits	Tumor, tethered cord, disc herniation with cord or cauda compression	Urgent MRI, neurosurgical consultation
Constitutional symptoms with bone pain	Malignancy (leukemia, Ewing sarcoma)	Complete blood count, inflammatory markers, imaging, consider bone marrow biopsy
Back pain with skin stigmata (hairy patch, dimple)	Tethered cord or spinal dysraphism	MRI of lumbosacral spine

Red Flags Requiring Urgent Workup

Age less than 4 years
Night pain awakening from sleep
Constant, unremitting pain
Progressive pain despite treatment
Neurological deficits (weakness, numbness, bowel or bladder dysfunction)

Constitutional symptoms (fever, weight loss, malaise)
Point tenderness over vertebra
History of malignancy
Immunocompromised state
Painful scoliosis

6. Diagnostic Investigations

A stepwise, evidence-based approach guided by clinical suspicion

Key Principle: The extent of investigation in pediatric back pain is guided by the presence of red flags, duration of symptoms, and clinical suspicion. Unlike adults where imaging is often deferred, children with persistent back pain (greater than 4 weeks) or any red flags warrant earlier and more comprehensive investigation given the higher likelihood of identifiable pathology.

When to Investigate

Clinical Scenario	Investigation Urgency	Recommended Approach
Any red flags present	URGENT	Immediate laboratory tests and imaging; MRI often indicated
Age less than 4 years with back pain	URGENT	Complete workup including laboratory tests and MRI
Pain greater than 4 weeks without improvement	SEMI-URGENT	Laboratory tests and radiographs; MRI if radiographs nondiagnostic
Adolescent athlete with mechanical pain less than 4 weeks	ROUTINE	Trial of activity modification; investigate if no improvement by 4 weeks
Acute onset after clear minor trauma, no red flags	ROUTINE	Conservative management; investigate if no improvement in 2-4 weeks

Baseline Laboratory Investigations

Investigation	Purpose	What to Look For	Practical Points
Complete blood count	Screen for infection, malignancy, anemia	Leukocytosis (infection), leukopenia or abnormal cells (leukemia), anemia (chronic disease, malignancy)	Normal count does not exclude infection or malignancy; peripheral smear if concern for leukemia
Erythrocyte sedimentation rate	Nonspecific marker of inflammation	Elevated in infection, inflammation, malignancy (often greater than 40 mm/hour)	Sensitive but not specific; may be normal early in infection
C-reactive protein	Acute phase reactant	Elevated in infection and inflammation; rises and falls faster than erythrocyte sedimentation rate	More specific for acute infection; useful for monitoring treatment response
Blood culture	Identify causative organism in infection	Positive in approximately 50% of vertebral osteomyelitis, less in discitis	Obtain before antibiotics if possible; multiple sets increase yield

Additional Laboratory Tests (When Indicated)

Investigation	Indication	What to Look For
HLA-B27	Suspected juvenile spondyloarthropathy	Positive in 80-90% of ankylosing spondylitis; supports but does not confirm diagnosis
Antinuclear antibody	Suspected autoimmune or connective tissue disease	Positive in juvenile idiopathic arthritis, systemic lupus erythematosus
Rheumatoid factor	Suspected polyarticular juvenile idiopathic arthritis	Positive in approximately 5-10% of juvenile idiopathic arthritis (polyarticular subtype)
Lactate dehydrogenase and uric acid	Suspected malignancy	Elevated in leukemia, lymphoma, tumor lysis
Urinalysis and urine culture	Suspected urinary tract source or referred pain	Infection, hematuria (renal pathology)
Urine catecholamines (vanillylmandelic acid, homovanillic acid)	Suspected neuroblastoma (young child)	Elevated in greater than 90% of neuroblastomas
Creatine kinase	Suspected myositis or muscular dystrophy	Elevated in muscle disease
Calcium, phosphate, alkaline phosphatase, vitamin D	Suspected metabolic bone disease	Abnormalities suggesting rickets, osteomalacia, hyperparathyroidism

Imaging Modalities

Plain Radiographs

When to Order

First-line imaging for most pediatric back pain lasting greater than 2-4 weeks
Suspected spondylolysis, spondylolisthesis, Scheuermann disease
Screening for bony abnormalities
Scoliosis assessment

What to Order

Anteroposterior and lateral views — Standard for lumbar or thoracic spine
Oblique views — Visualize pars interarticularis (spondylolysis); “Scottie dog” sign
Standing lateral — For spondylolisthesis grading and sagittal balance
Flexion-extension views — For instability (rarely needed in children)

Radiographic Finding	Condition Suggested	Next Step
Pars defect (“Scottie dog” collar)	Spondylolysis	If acute, MRI or bone scan to assess activity; grading if spondylolisthesis present
Anterior vertebral wedging greater than 5 degrees at 3 or more levels	Scheuermann disease	Kyphosis measurement; MRI if neurological symptoms
Disc space narrowing with endplate irregularity	Discitis	MRI to confirm; may be normal early in disease
Lytic lesion in vertebral body	Tumor (Langerhans cell histiocytosis, Ewing sarcoma, infection)	MRI and CT; consider biopsy
Vertebra plana (complete vertebral collapse)	Langerhans cell histiocytosis, pathological fracture	MRI, complete skeletal survey, further workup for systemic disease
Scalloping of posterior vertebral body	Intraspinal tumor, dural ectasia (Marfan syndrome)	MRI of spine
Normal radiographs	Does not exclude pathology	If clinical suspicion remains high, proceed to MRI; early spondylolysis and discitis often have normal radiographs

Magnetic Resonance Imaging (MRI)

MRI: The Gold Standard for Pediatric Spinal Imaging

MRI is the imaging modality of choice when detailed evaluation of the spine is required. It provides excellent visualization of soft tissues, disc, spinal cord, and bone marrow without ionizing radiation. In children, consider:

Sedation requirements: Often needed for children under 6-8 years; discuss with radiology
Scan duration: 30-60 minutes; longer studies may be challenging for young children
Contrast (gadolinium): Required for suspected infection, tumor, or inflammatory conditions
Whole spine MRI: Consider when looking for metastatic disease, drop metastases, or cord tumor

Indication	MRI Findings	Clinical Significance
Spondylolysis (acute)	Bone marrow edema in pars interarticularis on STIR or T2 fat-saturated sequences	Indicates active stress reaction; helps determine treatment approach
Discitis	Disc space enhancement, T2 hyperintensity, adjacent vertebral endplate changes, possible epidural or paraspinal abscess	More sensitive than radiographs; can identify complications
Disc herniation	Disc material extending beyond vertebral body margin, nerve root compression	Identifies level and severity; guides surgical planning if needed
Sacroiliitis	Bone marrow edema adjacent to sacroiliac joint, joint erosions, contrast enhancement	Earliest sign of juvenile spondyloarthropathy; may be present before radiographic changes
Tumor	Mass lesion, abnormal signal, contrast enhancement, cord compression	Characterizes lesion, identifies cord involvement; guides biopsy approach
Tethered cord	Conus medullaris below L2 level, thickened filum terminale, associated lipoma	Confirms diagnosis; identifies associated anomalies

Computed Tomography (CT)

Advantages

Superior bone detail compared to MRI
Fast acquisition (less sedation need)
Excellent for identifying osteoid osteoma nidus
Helpful for surgical planning (pedicle screw placement)

Disadvantages

Ionizing radiation — Significant concern in children
Poor soft tissue contrast compared to MRI
Does not visualize spinal cord well
Generally second-line after MRI in pediatrics

Specific indications for CT in pediatric spine:

Osteoid osteoma: Thin-slice CT (1-2 mm) is best for identifying the nidus
Complex fractures: Better bony detail than MRI
Spondylolysis: When MRI is inconclusive and pars anatomy needs clarification
Preoperative planning: For instrumentation

Nuclear Medicine Studies

Study	Indication	Advantages	Limitations
Bone scintigraphy (Technetium-99m bone scan)	Spondylolysis, metastatic disease, occult fracture, osteomyelitis, multifocal disease	High sensitivity for bone turnover; whole body assessment; can identify active lesions	Radiation exposure; poor specificity; may miss some lesions; SPECT improves localization
SPECT (single photon emission computed tomography)	Spondylolysis — improves localization over planar bone scan	Better anatomical localization than planar; higher sensitivity for pars lesions	Additional radiation; being replaced by MRI in many centers
Gallium or labeled white blood cell scan	Suspected infection when other imaging inconclusive	Specific for infection; useful when MRI contraindicated	Rarely needed with availability of MRI; radiation exposure

Targeted Investigations by Suspected Etiology

If Suspecting Spondylolysis or Spondylolisthesis

First-Line Tests

Lumbar radiographs (AP, lateral, obliques): May show pars defect; obliques show “Scottie dog” with collar sign
Standing lateral radiograph: Essential for grading spondylolisthesis (Meyerding classification)

Second-Line Tests

MRI: Detects bone marrow edema indicating active stress reaction; useful for treatment decisions
SPECT or bone scan: Alternative if MRI unavailable; identifies metabolically active lesions
CT: If pars anatomy unclear; preoperative planning

If Suspecting Discitis or Vertebral Osteomyelitis

First-Line Tests

Complete blood count, erythrocyte sedimentation rate, C-reactive protein: Elevated inflammatory markers support diagnosis
Blood cultures: Positive in approximately 50%; obtain before antibiotics
Spinal radiographs: May be normal early; disc space narrowing and endplate changes appear after 2-4 weeks

Second-Line Tests

MRI with contrast: Gold standard; shows disc and vertebral changes, identifies abscess
CT-guided biopsy: If no organism identified and diagnosis uncertain; culture and histopathology
Tuberculin skin test or interferon-gamma release assay: If tuberculosis suspected

If Suspecting Juvenile Spondyloarthropathy

First-Line Tests

Erythrocyte sedimentation rate, C-reactive protein: Often elevated; supports inflammatory diagnosis
HLA-B27: Positive in 80-90% of ankylosing spondylitis; supports but does not confirm diagnosis
Sacroiliac joint radiographs: May be normal early; sclerosis, erosions in established disease

Second-Line Tests

MRI of sacroiliac joints: Detects bone marrow edema and early sacroiliitis before radiographic changes; key for early diagnosis
Complete ophthalmological examination: Screen for uveitis
Consider gastrointestinal evaluation: If symptoms suggest inflammatory bowel disease

If Suspecting Tumor

First-Line Tests

Complete blood count with peripheral smear: Screen for leukemia
Lactate dehydrogenase, uric acid: Tumor markers
Spinal radiographs: May show lytic or blastic lesions, vertebra plana
MRI with contrast: Essential for characterization and staging

Second-Line Tests

CT (thin-slice): Specifically for osteoid osteoma; identifies nidus
Whole body bone scan: Screen for metastatic disease
CT chest, abdomen, pelvis: Staging for malignancy
Biopsy: CT-guided or surgical; essential for definitive diagnosis
Urine catecholamines: If neuroblastoma suspected (young child)

If Suspecting Disc Herniation

First-Line Tests

Lumbar radiographs: Exclude other pathology; may show disc space narrowing
MRI of lumbar spine: Gold standard; identifies herniation, level, and nerve root compression

Second-Line Tests

CT myelography: If MRI contraindicated
Electrodiagnostic studies (electromyography, nerve conduction studies): If clinical and MRI findings discordant

Investigations by Clinical Scenario: Summary Algorithm

Clinical Scenario	Laboratory Tests	Imaging	Additional Tests
Child under 4 years with back pain	Complete blood count, erythrocyte sedimentation rate, C-reactive protein, blood culture	Radiographs, then MRI with contrast	Urine catecholamines if under 2 years
Adolescent athlete, extension pain	Usually not required initially	Radiographs (including obliques); MRI if high clinical suspicion and radiographs negative	None usually needed
Night pain, relieved by nonsteroidal anti-inflammatory drugs	Complete blood count (screen for malignancy)	Thin-slice CT of suspected area; or radiographs then CT	May need MRI if CT negative
Inflammatory pattern (morning stiffness)	Erythrocyte sedimentation rate, C-reactive protein, HLA-B27	Sacroiliac joint MRI; spine radiographs	Ophthalmology referral; consider gastrointestinal evaluation
Fever and back pain	Complete blood count, erythrocyte sedimentation rate, C-reactive protein, blood cultures	Radiographs, then MRI with contrast	CT-guided biopsy if organism not identified
Neurological deficits	Complete blood count, erythrocyte sedimentation rate, C-reactive protein	Urgent MRI with contrast	Neurosurgical consultation

Diagnostic Criteria Reference

Meyerding Classification of Spondylolisthesis

Based on percentage of vertebral body slippage on standing lateral radiograph:

Grade I: 0-25% slippage
Grade II: 25-50% slippage
Grade III: 50-75% slippage
Grade IV: 75-100% slippage
Grade V (Spondyloptosis): Greater than 100% slippage

Clinical significance: Grades I-II typically managed conservatively; Grades III-V often require surgical evaluation.

Scheuermann Disease Diagnostic Criteria

Radiographic criteria (Sorensen criteria):

Anterior vertebral wedging of 5 degrees or more at 3 or more adjacent vertebrae
Thoracic kyphosis greater than 45 degrees
Additional features: Schmorl nodes, endplate irregularities, disc space narrowing

Clinical Pearl: The ALARA Principle

When imaging children, always follow the ALARA principle (As Low As Reasonably Achievable) for radiation exposure. MRI is preferred over CT when both provide equivalent diagnostic information. When CT is necessary, use pediatric-specific low-dose protocols. Avoid unnecessary repeat imaging and ensure each study is justified by clinical need.

7. Clinical Decision-Making

Practical algorithms and decision pathways for pediatric back pain

Step 1: Is This Urgent?

The first priority in evaluating a child with back pain is identifying those who require immediate or urgent evaluation.

Clinical Scenario	Urgency Level	Immediate Action
Acute neurological deficits (weakness, numbness, bowel or bladder dysfunction)	EMERGENT	Urgent MRI; neurosurgical consultation; consider cauda equina syndrome — surgical decompression within 48 hours improves outcomes
Saddle anesthesia or urinary retention	EMERGENT	Emergent MRI; immediate neurosurgical consultation; catheterize if retention; this is cauda equina syndrome until proven otherwise
Fever with severe back pain and toxic appearance	EMERGENT	Blood cultures, laboratory tests; broad-spectrum antibiotics; urgent MRI to rule out epidural abscess
Back pain after significant trauma	EMERGENT	Spinal immobilization; trauma workup; imaging based on mechanism and examination
Child under 4 years with back pain	URGENT	Same-day or next-day evaluation; laboratory tests (complete blood count, inflammatory markers); imaging likely required
Night pain awakening from sleep	URGENT	Evaluate within days; high suspicion for tumor (osteoid osteoma) or infection; imaging indicated
Constitutional symptoms (fever, weight loss, malaise)	URGENT	Evaluate within days; laboratory tests and imaging; consider infection and malignancy
Progressive pain despite conservative treatment	URGENT	Re-evaluate within 1-2 weeks; expand workup; imaging if not yet obtained
Adolescent athlete with mechanical pain, no red flags	ROUTINE	Activity modification; evaluate in 2-4 weeks if not improving; imaging if persistent
Acute minor strain, clear mechanism, no red flags	ROUTINE	Conservative management; follow-up in 2-4 weeks if not resolved

Step 2: Classify by Duration and Pattern

Acute (Less than 2 weeks)

Key questions:

Any red flags?
Clear traumatic mechanism?
Fever present?

Action: If no red flags, conservative management with reassessment in 1-2 weeks

Subacute (2-6 weeks)

Key questions:

Improving, stable, or worsening?
Mechanical or inflammatory pattern?
Response to treatment so far?

Action: Laboratory tests and imaging now indicated if not improving

Chronic (Greater than 6 weeks)

Key questions:

Has complete workup been done?
Are there psychosocial factors?
Multiple overlapping causes?

Action: Comprehensive evaluation; consider multidisciplinary approach

Step 3: Follow the Appropriate Algorithm

Algorithm A: Child Under 10 Years with Back Pain

Remember: Back pain in young children is uncommon and concerning. A lower threshold for investigation is appropriate.

Clinical Scenario	Most Likely Diagnosis	Action
Toddler refusing to walk or sit, irritable, low-grade fever	Discitis	Complete blood count, inflammatory markers, blood culture; spinal radiographs; MRI with contrast
Young child with point tenderness over vertebra, fever, elevated inflammatory markers	Vertebral osteomyelitis	MRI with contrast; blood cultures; start empiric antibiotics after cultures; consider biopsy if no organism
Child under 5 years with back mass, neurological symptoms	Neuroblastoma or other tumor	Urgent MRI; urine catecholamines; complete blood count; oncology consultation
Child with midline skin lesion (dimple, hairy patch) and back or leg symptoms	Tethered cord or spinal dysraphism	MRI of lumbosacral spine; neurosurgical consultation
School-age child with extension pain after starting gymnastics	Spondylolysis (early)	Radiographs; activity modification; MRI if radiographs negative and high clinical suspicion

Algorithm B: Adolescent with Back Pain (10-18 years)

Clinical Scenario	Most Likely Diagnosis	Action
Athlete with lumbar pain worse with extension, positive stork test	Spondylolysis	Radiographs (AP, lateral, obliques); if negative but high suspicion, MRI; activity modification for 6-12 weeks
Palpable step-off at lumbosacral junction, hamstring tightness	Spondylolisthesis	Standing lateral radiograph for grading; activity modification; physical therapy; surgical referral if high-grade or progressive
Thoracic pain with rigid kyphosis, worse with prolonged sitting	Scheuermann disease	Standing lateral radiograph; bracing if kyphosis 50-75 degrees and skeletally immature; physical therapy
Morning stiffness greater than 30 minutes, enthesitis, HLA-B27 positive	Juvenile spondyloarthropathy	MRI of sacroiliac joints; rheumatology referral; nonsteroidal anti-inflammatory drugs; consider disease-modifying therapy
Radicular leg pain, positive straight leg raise, dermatomal weakness	Disc herniation	MRI of lumbar spine; conservative management initially; surgical referral if progressive deficits or refractory pain
Night pain completely relieved by ibuprofen, possible scoliosis	Osteoid osteoma	Thin-slice CT; consider radiofrequency ablation or surgical excision
Multiple somatic complaints, school avoidance, inconsistent examination, normal workup	Functional or psychogenic pain	Multidisciplinary approach; physical therapy; psychology or psychiatry referral; avoid unnecessary investigations

“What Do I Do If…” Decision Reference

Clinical Situation	Immediate Action	Next Step
Radiographs are normal but symptoms persist beyond 4 weeks	Order MRI of the affected region	Many conditions (early spondylolysis, discitis, tumors) have normal radiographs initially
MRI shows bone marrow edema in pars interarticularis	Diagnose active spondylolysis (stress reaction)	Strict activity restriction; consider bracing; repeat imaging in 3 months to assess healing
Spondylolisthesis grade II or higher identified	Orthopedic or spine surgery referral	Serial imaging to monitor for progression; surgical stabilization may be needed
Inflammatory markers elevated but imaging negative	Consider early infection or inflammatory condition	Repeat MRI in 1-2 weeks; or proceed with bone scan; consider empiric treatment if high clinical suspicion
Pain persists despite 6 weeks of conservative treatment for presumed mechanical pain	Re-evaluate diagnosis; complete workup if not done	Consider alternative diagnoses; address psychosocial factors; multidisciplinary referral
Child with known scoliosis develops significant back pain	Do not assume scoliosis is the cause	MRI of entire spine to rule out underlying pathology (tumor, syrinx); scoliosis itself is typically painless
Suspected discitis but blood cultures negative	MRI confirms discitis; empiric antibiotics for Staphylococcus aureus	Consider CT-guided biopsy if no response to empiric treatment; tuberculosis testing in endemic areas
Parents request imaging for acute back pain without red flags	Explain rationale for conservative approach; set clear follow-up plan	Reassess in 2-4 weeks; imaging if not improving as expected
Adolescent with chronic pain, normal workup, missing significant school	Recognize possible amplified pain syndrome or functional disorder	Multidisciplinary pain program; physical therapy focus on function, not pain; psychology support; avoid opioids

Referral Guidelines

Specialty	When to Refer	Urgency
Pediatric Orthopedics or Spine Surgery	Spondylolisthesis grade II or higher; Scheuermann disease requiring bracing; disc herniation with neurological deficits; scoliosis evaluation	Urgent to routine depending on symptoms
Neurosurgery	Spinal cord or cauda equina compression; tethered cord; intraspinal tumor; disc herniation with progressive deficits	Emergent if neurological compromise; urgent otherwise
Pediatric Rheumatology	Suspected juvenile spondyloarthropathy; juvenile idiopathic arthritis with spinal involvement; chronic inflammatory back pain	Urgent to routine
Pediatric Oncology	Suspected or confirmed spinal tumor; leukemia; Langerhans cell histiocytosis	Urgent
Infectious Disease	Vertebral osteomyelitis or discitis not responding to empiric treatment; suspected tuberculosis; immunocompromised patient	Urgent to routine
Pain Medicine or Multidisciplinary Pain Program	Chronic pain syndrome; amplified pain; functional disability despite normal workup; significant school or activity impairment	Routine but important
Psychology or Psychiatry	Significant psychosocial factors; anxiety or depression; school avoidance; functional pain disorder	Routine
Physical Therapy	Most mechanical causes; post-treatment rehabilitation; core strengthening; postural training	Routine; essential component of management

Troubleshooting: Refractory or Unexplained Back Pain

Ask These Questions When Pain Persists

Is the diagnosis correct? — Revisit the history and examination; consider alternative diagnoses
Was the workup complete? — Has MRI been performed? Were inflammatory markers checked? Was HLA-B27 tested if inflammatory pattern?
Was treatment adequate? — Was activity modification truly followed? Was medication taken as prescribed? Was physical therapy attended?
Are there multiple overlapping causes? — Mechanical and inflammatory conditions can coexist; functional overlay is common in chronic pain
Are psychosocial factors contributing? — School stress, family dynamics, anxiety, depression, secondary gain
Is this amplified or centralized pain? — Pain out of proportion to findings; widespread pain; allodynia
Has the condition progressed? — Repeat imaging may be needed if significant time has passed
Is multidisciplinary care needed? — Chronic pain often requires coordinated approach

Return to Play Considerations for Athletes

Condition	Typical Time to Return	Criteria for Return
Muscle strain	1-4 weeks	Pain-free with activities of daily living; full range of motion; can complete sport-specific drills without pain
Spondylolysis (acute stress reaction)	3-6 months	Pain-free for 4-6 weeks; completed physical therapy; gradual return to sport with no recurrence
Spondylolisthesis (grade I, stable)	3-6 months	Pain-free; core strengthening complete; no progression on imaging; may need activity modification long-term
Disc herniation (conservative management)	3-6 months	Resolution of radicular symptoms; full strength; normal neurological examination; completed rehabilitation
Scheuermann disease	Variable	Pain controlled; may participate in non-contact sports; avoid heavy loading in severe kyphosis

8. Clinical Pearls and Pitfalls

Practical wisdom — learn from experience and avoid common mistakes

Must-Know Clinical Pearls

Pediatric back pain is different from adult back pain: Unlike adults where 85% of back pain is nonspecific, children have an identifiable cause in up to 50% of cases. The younger the child, the more likely serious pathology exists.

Age under 4 years is a red flag itself: Back pain is rare in young children. Any child under 4 years presenting with back pain, refusal to walk, or irritability warrants thorough investigation including imaging.

Night pain relieved by nonsteroidal anti-inflammatory drugs is classic for osteoid osteoma: This pattern is highly suggestive. Order thin-slice CT to identify the nidus. Complete pain relief with nonsteroidal anti-inflammatory drugs is virtually diagnostic.

Spondylolysis is the most common cause of back pain in adolescent athletes: Think of it in any young athlete with lumbar pain worse with extension, especially in gymnastics, football, dance, diving, and wrestling.

The stork test is highly sensitive for spondylolysis: Single leg hyperextension reproducing ipsilateral lumbar pain is a valuable clinical sign. Use it routinely in adolescent athletes with back pain.

Hamstring tightness is a clue to spondylolisthesis: The hamstrings tighten as a protective mechanism. Always check for a palpable step-off at the lumbosacral junction when hamstrings are tight.

Discitis in toddlers presents as refusal to walk: A toddler who was walking normally and now refuses may have discitis. Look for loss of lumbar lordosis, irritability, and subtle fever. Inflammatory markers are usually elevated.

Morning stiffness greater than 30 minutes suggests inflammatory disease: This pattern points toward juvenile spondyloarthropathy. Check HLA-B27 and order MRI of sacroiliac joints for early diagnosis.

Painful scoliosis requires investigation: Adolescent idiopathic scoliosis is typically painless. When pain is prominent, search for an underlying cause such as osteoid osteoma, syringomyelia, or spinal cord tumor.

Normal radiographs do not exclude pathology: Early spondylolysis, discitis, and tumors often have normal plain films. MRI is far more sensitive and should be ordered when clinical suspicion is high despite normal radiographs.

Critical Pitfalls to Avoid

Assuming pediatric back pain is benign like adult back pain: Do not apply adult “wait and see” approaches to young children. The threshold for investigation should be lower, especially in children under 10 years.

Attributing pain to scoliosis without further workup: Scoliosis itself rarely causes significant pain. If a child with scoliosis has prominent back pain, investigate for underlying pathology with MRI of the entire spine.

Missing cauda equina syndrome: Always ask about bowel and bladder function. Saddle anesthesia and urinary retention are emergencies requiring immediate MRI and surgical consultation. Delay can result in permanent deficits.

Stopping the workup after normal radiographs: Many serious conditions have normal initial radiographs. If symptoms persist beyond 4 weeks or red flags are present, proceed to MRI regardless of radiograph results.

Overlooking infection in young children: Discitis and vertebral osteomyelitis can present subtly. Fever may be low-grade or absent initially. A toddler who refuses to sit or walk should raise suspicion for spinal infection.

Ignoring the hip as a source of “back pain”: Hip pathology commonly refers pain to the back, groin, or thigh. Always examine the hips in a child presenting with back pain, especially if spinal examination is unremarkable.

Dismissing pain as “growing pains” or psychogenic too early: While functional pain exists, it is a diagnosis of exclusion. Ensure an adequate workup before attributing symptoms to psychological causes, especially if there are any atypical features.

Missing midline skin stigmata: Hair tufts, dimples, lipomas, or hemangiomas over the spine may indicate underlying spinal dysraphism or tethered cord. Always inspect the entire spine with the patient undressed.

Inadequate activity restriction for spondylolysis: Spondylolysis requires true rest from aggravating activities for 6-12 weeks for healing. Allowing early return to sport leads to nonunion and chronic pain.

Prescribing opioids for chronic pediatric back pain: Opioids are rarely appropriate for chronic non-malignant pain in children. They can worsen outcomes in functional pain syndromes and carry significant risks. Focus on multidisciplinary rehabilitation.

Key Takeaways

Pediatric back pain has an identifiable cause in up to 50% of cases — much higher than the 15% rate in adults. Approach with a diagnostic mindset.
Age is critical: Back pain in children under 4 years is rare and warrants urgent evaluation. The younger the child, the greater the concern for serious pathology.
Red flags require urgent workup: Night pain, constant pain, neurological deficits, constitutional symptoms, and pain in very young children all demand prompt investigation.
Spondylolysis is the most common structural cause in adolescent athletes. Look for extension-related pain and use the stork test. MRI detects early stress reactions before radiographic changes.
Distinguish mechanical from inflammatory pain: Morning stiffness greater than 30 minutes that improves with activity suggests juvenile spondyloarthropathy — order HLA-B27 and sacroiliac joint MRI.
Painful scoliosis is not typical: If a child with scoliosis has significant back pain, investigate for underlying pathology such as osteoid osteoma, syrinx, or tumor.
Normal radiographs do not exclude serious disease. MRI is the gold standard for evaluating persistent or concerning pediatric back pain.
Always examine the hips: Hip pathology commonly presents as back or groin pain in children.
Night pain relieved completely by nonsteroidal anti-inflammatory drugs is classic for osteoid osteoma. Order thin-slice CT to confirm.
Functional pain is a diagnosis of exclusion, but when identified, requires a multidisciplinary approach focused on restoring function rather than eliminating pain.

Quick Reference Algorithm

Systematic Approach to Pediatric Back Pain:

Assess for emergencies: Neurological deficits (especially bowel or bladder dysfunction) require emergent MRI and neurosurgical consultation
Identify red flags: Age under 4 years, night pain, constant pain, fever, weight loss, neurological symptoms, progressive course
Characterize the pain: Mechanical (worse with activity) versus inflammatory (morning stiffness, improves with activity)
Consider age-appropriate diagnoses:
- Young children: infection (discitis), tumor, congenital anomalies
- Adolescents: spondylolysis, Scheuermann disease, disc pathology, overuse
Perform thorough examination: Include gait, standing posture, range of motion, neurological examination, hip examination, and skin inspection
Order investigations based on clinical findings:
- Red flags present: Urgent laboratory tests and MRI
- No red flags, less than 4 weeks: Conservative management with reassessment
- No red flags, greater than 4 weeks: Laboratory tests and imaging (start with radiographs, proceed to MRI if needed)
Treat the underlying cause: Activity modification, physical therapy, medications, or referral as appropriate
Re-evaluate if not improving: Reconsider diagnosis, expand workup, address psychosocial factors, consider multidisciplinary care

Summary Table: Common Conditions at a Glance

Condition	Typical Age	Key Feature	Best Test	Treatment
Spondylolysis	Adolescent	Extension pain, athlete	MRI (bone edema) or SPECT	Activity restriction 3-6 months
Spondylolisthesis	Adolescent	Palpable step-off, hamstring tightness	Standing lateral radiograph	Physical therapy; surgery if high-grade
Scheuermann disease	Adolescent	Rigid thoracic kyphosis	Lateral radiograph (wedging at 3+ levels)	Bracing if skeletally immature; physical therapy
Discitis	Toddler or young child	Refusal to walk, irritability	MRI with contrast	Antibiotics (Staphylococcus coverage)
Osteoid osteoma	5-20 years	Night pain relieved by nonsteroidal anti-inflammatory drugs	Thin-slice CT (nidus)	Radiofrequency ablation or excision
Juvenile spondyloarthropathy	Older child or adolescent	Morning stiffness, enthesitis	Sacroiliac joint MRI; HLA-B27	Nonsteroidal anti-inflammatory drugs; disease-modifying therapy
Disc herniation	Adolescent	Radicular pain, positive straight leg raise	MRI of lumbar spine	Conservative; surgery if progressive deficits
Muscle strain	Any age	Acute onset, localized tenderness	Clinical diagnosis	Rest, ice, nonsteroidal anti-inflammatory drugs, physical therapy