01Approach to the Critical Patient/attcp31

Key Concepts

›LCPD is not a medical emergency in most cases but requires prompt recognition to prevent irreversible femoral head deformity

›Avascular necrosis of femoral head in children aged 4-8 years

›Self-limited course spanning 2-5 years through necrosis, fragmentation, reossification, and healing stages

›Delay in diagnosis is the primary preventable harm; knee pain as sole complaint is a common pitfall

Urgent Differentiation

›Septic arthritis exclusion is the highest-priority acute decision

›Fever plus hip pain plus inability to bear weight requires urgent evaluation

›Kocher criteria predict probability of septic arthritis vs transient synovitis

›If septic arthritis cannot be excluded, emergent orthopedic consultation and joint aspiration indicated

›LCPD does not cause fever or marked elevation of CRP and ESR

›SCFE exclusion in older or overweight child

›Obligatory external rotation with hip flexion is diagnostic of SCFE

›Frog-leg lateral radiograph confirms SCFE; do not obtain frog-leg if SCFE strongly suspected

›Urgent orthopedic referral for any suspected SCFE

›Head-at-risk signs on radiograph require urgent orthopedic evaluation

›Lateral subluxation of femoral head

›Gage sign (V-shaped defect in lateral epiphysis)

›Calcification lateral to epiphysis

›Horizontal physis

›Metaphyseal cysts

PITFALLS

›Common diagnostic errors in LCPD

›Knee pain as sole complaint leads to knee workup and delayed hip diagnosis

›Normal early radiographs do not exclude LCPD; obtain MRI if clinical suspicion is high

›Bilateral involvement in approximately 10% of cases; examine both hips

›LCPD in girls carries worse prognosis; do not underestimate severity in female patients

›Failure to recognize head-at-risk signs delays definitive surgical referral

02History/hx42

Presenting Symptoms

›Chief complaint patterns

›Painless limp (classic presentation)

›Hip pain, groin pain, anterior thigh pain, or referred ipsilateral knee pain

›84% present with some degree of pain; mean pain score 3/10 in prospective multicenter study

›Knee pain as sole complaint without hip symptoms is a recognized pitfall

›Pain characteristics

›Insidious onset over weeks to months

›Chronic limp lasting more than 6 weeks is characteristic

›Aggravated by activity, prolonged weight-bearing, running, and jumping

›Partially relieved by rest

›63% of children use pain medications; 65% require them more than once per week

›30% of children miss school due to pain

Alarm Features

›Red flags requiring urgent or emergent workup

›Fever plus hip pain plus inability to bear weight — rule out septic arthritis

›Acute severe hip pain in overweight adolescent — consider SCFE

›Night pain, weight loss, or night sweats — consider malignancy

›Bilateral hip involvement with systemic features — consider hypothyroidism, sickle cell disease, Gaucher disease, or steroid-induced AVN

›Rapidly progressive loss of ROM — urgent orthopedic referral

Risk Factors

›Patient-level risk factors

›Age 4-8 years (peak incidence)

›Male sex; 4-5:1 male-to-female ratio

›White race; higher incidence in Caucasian populations

›Low birth weight and delayed skeletal maturation

›Short stature relative to peers

›Low socioeconomic status; consistently associated in epidemiologic studies

03Physical Exam/exam22

Gait and Inspection

›Gait assessment

›Antalgic gait due to pain with weight-bearing

›Trendelenburg gait; pelvis drops to contralateral side due to abductor weakness

›Leg-length discrepancy on inspection

›Thigh and calf atrophy on affected side

Range of Motion

›Hip ROM assessment

›Decreased internal rotation and abduction — most sensitive examination finding

›Log roll test; pain with gentle internal and external rotation of the hip

›Flexion-abduction-external rotation (FABER) test; may reproduce hip pain

›Adductor spasm may further restrict abduction

›Loss of extension in advanced disease

Special Tests

›Functional hip tests

›Trendelenburg test; positive if abductor weakness is present

›Palpation over hip joint; typically non-tender in LCPD (unlike septic arthritis)

›Spine assessment to exclude referred pain from lumbar pathology

Vital Signs

›Hemodynamic and fever assessment

›Should be afebrile; fever raises concern for septic arthritis or osteomyelitis

›Heart rate and blood pressure normal in isolated LCPD

›Toxic appearance is not consistent with LCPD; suggests infection or malignancy

Contralateral Hip

›Bilateral involvement screening

›Bilateral in approximately 10% of cases; examine contralateral hip in every patient

›Bilateral symmetric involvement raises concern for systemic etiology

04Differential Diagnosis/ddx42

Infectious Causes

›Septic arthritis (ICD-10: M00.851)

›Most dangerous diagnosis to miss; surgical emergency

›Fever, toxic appearance, refusal to bear weight, markedly elevated CRP and ESR

›CRP greater than 2 mg/dL and ESR greater than 40 mm/hr raise probability

›Kocher criteria: fever, non-weight-bearing, ESR greater than 40, WBC greater than 12

›Requires urgent aspiration and washout

›Osteomyelitis (ICD-10: M86.151)

›Fever, focal bony tenderness, elevated inflammatory markers

›MRI is most sensitive for early osteomyelitis

Mechanical and Structural Causes

›Transient synovitis (ICD-10: M67.351)

›Most common cause of acute hip pain in children ages 3-8

›Self-limited, often post-viral; acute onset with normal radiographs

›Resolution within 1-2 weeks; LCPD presents more insidiously

›Slipped capital femoral epiphysis — SCFE (ICD-10: M93.001)

›Older child age 10-16; often overweight or obese

›Obligatory external rotation with hip flexion

›Displacement visible on frog-leg lateral radiograph

›Developmental dysplasia of the hip — DDH (ICD-10: Q65.89)

›Leg-length discrepancy, limited abduction

›Usually detected in infancy; late presentation can mimic LCPD

Hematologic and Metabolic Causes

›Sickle cell disease AVN (ICD-10: D57.1)

›Known hemoglobinopathy; bilateral involvement common

›Hemoglobin electrophoresis confirms diagnosis

›Gaucher disease (ICD-10: E75.22)

›Bilateral hip involvement with organomegaly

05Laboratory Tests/lt27

Inflammatory Markers

›CRP and ESR

›Normal or minimally elevated in LCPD

›Markedly elevated in septic arthritis; CRP greater than 2 mg/dL or ESR greater than 40 mm/hr

›Sensitivity of CRP greater than 2 mg/dL for septic arthritis approximately 74%

›Used primarily to exclude infectious etiology, not to confirm LCPD

Complete Blood Count

›CBC with differential

›Normal in LCPD

›Elevated WBC suggests infection or malignancy

›Anemia or thrombocytopenia raises concern for leukemia or sickle cell disease

›Eosinophilia may suggest parasitic or allergic etiology

Microbiologic Testing

›Blood cultures

›Indicated if septic arthritis or osteomyelitis is suspected

›Positive in approximately 36-76% of pediatric septic arthritis cases

›Joint fluid culture is more sensitive than blood culture for septic arthritis

Specialized Laboratory Testing

›Coagulation studies

›Protein C and protein S levels if thrombophilia workup is warranted

›Factor V Leiden and prothrombin gene mutation testing

›Some studies suggest hypercoagulable states contribute to vascular disruption in LCPD

›Thyroid function tests and IGF-1

›Ordered if endocrine etiology is suspected

›Hypothyroidism can cause bilateral epiphyseal dysplasia mimicking LCPD

›Hemoglobin electrophoresis

›Indicated if sickle cell disease is a consideration

›Bilateral involvement or systemic features are indications

06Diagnostic Tests/dt91

Scoring Systems

›Kocher Criteria for septic arthritis vs transient synovitis

›Four criteria: fever, non-weight-bearing, ESR greater than 40 mm/hr, WBC greater than 12 x10^9/L

›0 criteria: less than 0.2% probability of septic arthritis

›1 criterion: 3% probability

›2 criteria: 40% probability

›3 criteria: 93% probability

›4 criteria: 99.6% probability

›CRP greater than 2 mg/dL added in modified Kocher criteria increases sensitivity

›Lateral Pillar Classification (Herring Classification)

›Applied during the fragmentation stage of LCPD

›Group A: No involvement of lateral pillar; full height maintained; best prognosis

›Group B: Greater than 50% lateral pillar height maintained; good prognosis if age less than 8

›Group B/C border: Exactly 50% height maintained or thin poorly ossified lateral pillar

›Group C: Less than 50% lateral pillar height; worst prognosis regardless of treatment

›Strongest single radiographic prognostic indicator along with age at onset

›Catterall Classification

›Based on extent of femoral epiphyseal involvement on radiograph

›Group I: Anterior epiphysis only; no collapse or sequestrum

›Group II: Anterior involvement with sequestrum formation; metaphyseal changes

›Group III: Large sequestrum; nearly all of head involved

›Group IV: Whole head involved; significant metaphyseal changes

›Waldenstrom Staging

›Stage I (Initial/Necrosis): Dense epiphysis, widened medial joint space, subchondral fracture

›Stage II (Fragmentation): Epiphyseal fragmentation and resorption

›Stage III (Reossification): New bone formation within femoral head

›Stage IV (Healed): Final femoral head shape established

›Stulberg Classification (outcome classification at skeletal maturity)

›Class I: Normal spherical femoral head; normal acetabulum

›Class II: Spherical but large femoral head with coxa magna or coxa plana

›Class III: Non-spherical, not flat femoral head

›Class IV: Flat femoral head with matching flat acetabulum; congruent

›Class V: Flat femoral head with normal acetabulum; incongruent

›Classes I and II predict no arthritis; classes IV and V predict early osteoarthritis

›HAT Classification (Head, Acetabulum, Trochanter)

›Newer classification evaluating all three components at skeletal maturity

›Strong correlation with functional outcomes at 20-year follow-up

›Trochanteric overgrowth is a distinct measurable outcome component

MRI

›MRI hip indications and technique

›First-line when clinical suspicion for LCPD is high but radiographs are normal or equivocal

›More sensitive than radiography for early avascular necrosis detection

›Contrast-enhanced MRI detects perfusion deficits within the femoral epiphysis

›Shows bone marrow edema, extent of necrosis, cartilaginous changes, and synovitis

›Useful for surgical planning to assess femoral head containment

›MRI findings in LCPD

›Decreased signal on T1-weighted sequences within femoral epiphysis

›Increased signal on T2-weighted sequences representing marrow edema

›Gadolinium enhancement deficit indicates ischemic zone

›Diffusion-weighted imaging can quantify degree of ischemia; predictor of head deformity

›Extent of epiphyseal involvement on MRI correlates with lateral pillar classification

›MRI vs radiograph

›MRI detects LCPD 6-12 months earlier than plain radiographs in some cases

›Radiographs remain first-line due to availability and cost; MRI used for equivocal or early cases

›MRI preferred over bone scan for staging and surgical planning

CT

›CT hip indications in LCPD

›Not routinely indicated for primary diagnosis or staging of LCPD

›Superior for detecting nidus in osteoid osteoma (key differential)

›Used for surgical planning in complex pelvic and femoral osteotomies

›Preoperative assessment of acetabular coverage and femoral head morphology

›CT findings in LCPD

›Epiphyseal sclerosis and fragmentation visible on CT

›Metaphyseal cysts and irregularity identifiable

›3D reconstruction assists in evaluating femoral head sphericity pre-operatively

›Radiation consideration in pediatric patients; MRI preferred when soft tissue detail is needed

Ultrasound

›Point-of-care ultrasound indications

›Detection of hip joint effusion in the emergency department

›Useful to differentiate transient synovitis from LCPD (both may have effusion)

›Guided joint aspiration for suspected septic arthritis

›Prospective study showed POCUS decision algorithm for transient synovitis had sensitivity 98% and specificity 92% in pediatric ED

›Ultrasound technique

›Anterior longitudinal view of hip joint

›Effusion seen as anechoic or hypoechoic fluid anterior to femoral neck

›Measure capsule-to-bone distance; greater than 2 mm or asymmetric compared to contralateral side is significant

›Doppler assessment of femoral head vascularity is limited in reliability for LCPD staging

›Ultrasound limitations

›Cannot assess bone marrow or epiphyseal viability

›Normal ultrasound does not exclude LCPD

›Radiograph and MRI remain standard for LCPD diagnosis and staging

Plain Radiography

›Standard radiographic views

›AP pelvis and frog-leg lateral radiograph are first-line imaging in all suspected cases

›Both views required; frog-leg lateral reveals lateral pillar and crescent sign

›Compare both hips for symmetry

›Early radiographic findings

›Smaller or denser femoral epiphysis (sclerosis)

›Widened medial joint space

›Subchondral fracture (crescent sign) on frog-leg lateral

›May be entirely normal in the initial necrosis stage

›Later radiographic findings

›Epiphyseal fragmentation and resorption

›Femoral head flattening

›Metaphyseal cysts and irregularity

›Lateral subluxation of femoral head (head-at-risk sign)

07Disposition/dispo26

Discharge Criteria

›Safe discharge from ED

›Suspected or confirmed LCPD without septic arthritis features

›Pain adequately controlled with oral NSAIDs

›Weight-bearing tolerated with or without assistive device

›Reliable follow-up with pediatric orthopedic surgery within 1-2 weeks confirmed

›Clear return precautions provided to family

›Discharge with crutches and activity restriction pending orthopedic evaluation

›Protected weight-bearing reduces mechanical load on avascular femoral head

›Restrict running, jumping, and contact sports pending specialist assessment

Admission Criteria

›Indications for inpatient admission

›Severe pain uncontrolled with oral analgesics

›Need for traction or casting (e.g., Petrie casts)

›Concern for septic arthritis requiring aspiration and washout

›Planned surgical intervention

›Diagnostic uncertainty requiring urgent MRI or orthopedic input

Orthopedic Referral Triggers

›Indications for urgent or routine orthopedic referral

›All confirmed or suspected LCPD require pediatric orthopedic surgery referral

›Age greater than 6 years at diagnosis warrants earlier orthopedic involvement given worse prognosis

›Loss of ROM, progressive subluxation, or head-at-risk signs require urgent evaluation

›Bilateral disease warrants endocrine and hematologic workup in addition to orthopedic referral

Follow-Up Planning

›Long-term monitoring requirements

›Initial orthopedic follow-up within 1-2 weeks of diagnosis

›Serial radiographs every 2-3 months during active disease to monitor staging and progression

›Disease course spans 2-5 years from onset to healing

08Treatment/t61

Initial ED Management

›Acute pain and mobility management

›NSAIDs first-line for pain and hip synovitis

›Ibuprofen 10 mg/kg orally every 6-8 hours

›Maximum single dose 400-600 mg in children; weight-based for those under 30 kg

›Naproxen 5-7 mg/kg orally every 8-12 hours as alternative

›Acetaminophen as adjunct if NSAID monotherapy insufficient

›15 mg/kg orally every 4-6 hours

›Maximum 75 mg/kg per day

›Aspirin avoided in children due to Reye syndrome risk

›Avoid prolonged corticosteroids; can worsen avascular necrosis

›Crutches or assistive device for protected weight-bearing

›Activity restriction pending orthopedic evaluation

Non-Surgical Management

›Conservative treatment (mainstay for children under 6 years or Herring Group A)

›ROM exercises emphasizing hip abduction and internal rotation stretching

›Physical therapy referral for guided exercise program

›Home exercise program for daily stretching

›Goal to maintain abduction greater than 30 degrees

›Activity modification

›Allow swimming, cycling, and short walks

›Restrict running, jumping, trampolining, and contact sports during initial and fragmentation stages

›No total non-weight-bearing is recommended at any stage

›Abduction bracing and Petrie casting

›Used to maintain femoral head containment within acetabulum

›Scottish Rite brace permits ambulation while maintaining abduction

›Petrie casts maintain fixed abduction but limit mobility

›Evidence for bracing efficacy is limited; not consistently superior to observation

›Duration of non-surgical management

›Active treatment phase typically 18-24 months

›Monitoring continues until skeletal maturity

Surgical Management

›Operative indications

›Children greater than 8 years at onset with Herring Group B or B/C border

›Progressive subluxation or loss of containment despite conservative measures

›Head-at-risk signs on radiograph

›Femoral varus osteotomy

›Redirects femoral head into acetabular containment

›Most commonly performed surgical procedure for LCPD

›No significant outcome difference between femoral and innominate osteotomy in randomized studies

›Both surgical approaches superior to non-operative treatment in older children with Group B and B/C hips

›Salter innominate osteotomy

›Improves acetabular coverage of the femoral head

›Redirects acetabulum anterolaterally to cover femoral head

›Combined femoral and pelvic osteotomy

›Reserved for severe cases with large subluxation

›Provides maximum coverage and containment

›Shelf acetabuloplasty

›Salvage procedure for advanced cases with lateral head extrusion

›May provide better functional outcomes than conservative management in selected patients

›Comparative study showed superior isokinetic hip muscle strength in surgically managed group

›Hip joint distraction (arthrodiastasis)

›Emerging technique to unload the femoral head and promote remodeling

›External fixator maintains joint space distraction for 4-6 months

›Not yet standard of care; ongoing research

Post-Operative and Long-Term Management

›Post-surgical monitoring

›Serial radiographs to assess reossification and head sphericity

›Physical therapy for ROM restoration post-osteotomy

›Hardware removal at 6-12 months post-osteotomy as appropriate

›Long-term osteoarthritis prevention

›Maintain healthy weight to reduce mechanical load

›Activity modification to minimize high-impact loading

›Early adult follow-up for OA surveillance; 44% had moderate-severe OA at 20-year follow-up in one cohort

›Total hip arthroplasty planning in adulthood for severe aspherical femoral head outcomes

09Special Populations/sp29

Pregnancy

›LCPD and reproductive age considerations

›LCPD occurs in childhood; pregnancy considerations arise for women with prior LCPD reaching reproductive age

›Hip dysplasia and femoral head deformity from prior LCPD may affect obstetric delivery planning

›Orthopaedic assessment recommended prior to planned delivery in women with significant femoral head deformity

›Pelvic osteotomy history may limit vaginal delivery; caesarean section may be preferred

›NSAIDs avoid in third trimester; paracetamol preferred for musculoskeletal pain in pregnancy

Geriatric

›Long-term outcomes in adults with prior LCPD

›Premature osteoarthritis develops by sixth decade in approximately 50% of patients with aspherical femoral head outcomes

›44% moderate-severe OA at 20-year follow-up regardless of initial treatment approach

›Stulberg class IV and V outcomes strongly predict total hip arthroplasty need in adulthood

›Femoroacetabular impingement from residual head deformity requires surgical management in symptomatic adults

›Greater trochanteric overgrowth may cause abductor weakness and Trendelenburg gait in adults

›OA management follows standard protocols; NSAIDs, physiotherapy, intra-articular corticosteroid injections

›Total hip arthroplasty for end-stage OA; younger age of presentation compared to primary OA

Pediatrics

›Age-specific management considerations

›Age at onset is the single most powerful prognostic factor alongside lateral pillar classification

›Under 6 years: Generally favorable natural history; non-surgical management is mainstay

›Observation, ROM exercises, and activity modification sufficient in most cases

›Surgical intervention rarely required

›6-8 years: Intermediate prognosis; management guided by Herring classification

›Group A and B hips managed conservatively

›Group B/C and C hips may benefit from surgical containment

›Over 8 years: Poor prognosis; higher risk of femoral head deformity and early OA

›Herring Group B and B/C hips benefit from surgical intervention

›Group C hips have poor outcomes regardless of treatment modality

10Background/b62

Epidemiology

›Incidence and prevalence

›Estimated incidence 0.4-29 per 100,000 children depending on geographic and ethnic population

›Higher incidence in Caucasian populations; lower in Black and Asian populations

›Male-to-female ratio 4-5:1

›Peak age of onset 4-8 years; can occur from age 2 to 12

›Unilateral in approximately 90% of cases

›Bilateral synchronous in 10%; bilateral sequential involvement occasionally occurs

›Risk factor epidemiology

›Low socioeconomic status consistently associated in population-based studies

›Secondhand smoke exposure identified in 19% of multicenter study cohort

›29% of affected US children were overweight or obese

›Familial cases associated with COL2A1 gene mutations in some pedigrees

›Short stature relative to peers is a recognized association

›Natural history and outcomes

›Disease course 2-5 years from necrosis through healing

›Aspherical femoral head deformity in 59% of non-surgically managed cohort at long-term follow-up

›44% moderate-severe osteoarthritis at 20-year follow-up

›Disabling arthritis develops by sixth decade in approximately 50% of patients with poor femoral head outcome

Pathophysiology

›Mechanism of avascular necrosis

›LCPD results from interruption of blood supply to the femoral head epiphysis

›Precise etiology is unknown; likely multifactorial

›Proposed mechanisms include thrombophilia, venous hypertension, trauma, and genetic predisposition

›Lateral epiphyseal vessels are vulnerable due to their intracapsular course

›Ischemia leads to bone death of the ossific nucleus of the femoral head

›Disease stages (Waldenstrom staging)

›Stage I — Necrosis: Bone death without structural collapse; radiograph may be normal or show dense epiphysis and crescent sign

›Stage II — Fragmentation: Dead bone resorbed by vascular granulation tissue; epiphysis fragments; femoral head most vulnerable to deformity

›Stage III — Reossification: New bone lays down within the femoral head; revascularization occurs

›Stage IV — Healed: Remodeling complete; final femoral head shape established by skeletal maturity

›Determinants of femoral head deformity

›Extent of epiphyseal involvement (Herring lateral pillar classification)

›Age at onset; older children have less remodeling potential

›Duration of fragmentation stage

›Femoral head containment within the acetabulum during fragmentation

›Head-at-risk signs indicate impending subluxation and deformity

›Long-term articular consequences

›Aspherical femoral head creates cam-type femoroacetabular impingement

›Greater trochanteric overgrowth due to lateral physis disruption

›Leg-length discrepancy from epiphyseal growth plate involvement

›Premature osteoarthritis from incongruent articular surfaces

Therapeutic Considerations

›Containment principle

›The central concept guiding all LCPD treatment decisions

›Femoral head must be maintained within the acetabulum during the vulnerable fragmentation stage

›Acetabulum acts as a mold to shape the reossifying femoral head into a spherical form

›Containment can be achieved by abduction (bracing or casting) or surgically (osteotomy)

›Evidence base for surgical vs non-surgical treatment

›Herring multicenter prospective study (2004): Surgical containment superior to non-operative in children over 8 with Group B and B/C hips

›No significant difference between femoral osteotomy and Salter innominate osteotomy in outcomes

›Group C hips have poor outcomes regardless of treatment modality

›Non-operative treatment at 20-year follow-up (Larson 2012): Good outcomes in younger children; Group B patients age 8 or older had poorer non-operative outcomes

›Activity and loading considerations

›Total non-weight-bearing is not recommended at any stage of LCPD

›Protected weight-bearing with crutches is appropriate during symptomatic phases

›Swimming and cycling are safe low-impact activities throughout treatment

›Running, jumping, and contact sports restricted during initial and fragmentation stages

›Survey of pediatric orthopedic surgeons and physiotherapists supports activity modification over immobilization

›Pharmacotherapy evidence

›NSAIDs provide symptomatic relief and reduce hip synovitis

›No disease-modifying pharmacotherapy is established as standard of care

›Bisphosphonate research ongoing but not currently recommended outside clinical trials

›Anti-resorptive agents under investigation to prevent fragmentation-stage bone loss

›Corticosteroids contraindicated; worsen avascular necrosis

11Patient Discharge Instructions/pdi29

copy discharge instructions

›Legg-Calvé-Perthes Disease — Discharge Instructions

›Your child has been diagnosed with Legg-Calvé-Perthes disease, a condition where the ball of the hip joint temporarily loses its blood supply

›The bone goes through a healing process that takes 2-5 years

›Follow up with a pediatric bone (orthopedic) specialist within 1-2 weeks

›Medications at home

›Give ibuprofen (Advil or Motrin) for pain: 10 mg/kg by mouth every 6-8 hours with food

›Give acetaminophen (Tylenol) as directed if ibuprofen is not sufficient

›Do not give aspirin to children

›Do not give steroid medications (prednisone) unless specifically prescribed by your specialist

›Activity restrictions

›Your child may walk with crutches as directed to reduce pressure on the hip

›Swimming and cycling are safe and encouraged

›Restrict running, jumping, trampolining, and contact sports until the orthopedic specialist advises otherwise

›Your child does not need to stay in bed; light activity is encouraged

›School and social participation

›Your child can attend school; discuss activity modifications with the school

›Emotional support is important; some children experience school absenteeism and social withdrawal

›Contact your child's school to arrange accommodations as needed

›Return to the emergency department if

›Fever develops (temperature above 38.5 degrees Celsius) with hip pain or inability to walk

›Worsening limp or sudden inability to bear weight

›Increasing pain not relieved by ibuprofen or acetaminophen

›Pain in the other hip develops

›Your child appears very unwell, toxic, or has severe pain

›Important information for families

›This disease is self-limiting but takes years to fully heal

›Regular X-rays every 2-3 months will be needed to monitor progress

12References/r28

Guidelines and Key Sources

›Gilbert SR, Laine JC, Martin BD, Sankar WN, Kim HKW. Legg-Calvé-Perthes Disease. Journal of the American Academy of Orthopaedic Surgeons. 2025. PMID 40991851

›Comprehensive 2025 AAOS review covering diagnosis, staging, and treatment algorithms

›Beni R, Hussain SA, Monsell F, Gelfer Y. Management of Legg-Calve-Perthes Disease: A Scoping Review With Advice on Initial Management. Archives of Disease in Childhood. 2025. PMID 39613451

›Multicenter prospective data on pain prevalence, functional impact, and initial management

›Herring JA, Kim HT, Browne R. Legg-Calve-Perthes Disease. Part II: Prospective Multicenter Study of the Effect of Treatment on Outcome. Journal of Bone and Joint Surgery. 2004. PMID 15466720

›Landmark prospective study establishing lateral pillar classification as strongest prognostic indicator

›Herring JA, Kim HT, Browne R. Legg-Calve-Perthes Disease. Part I: Classification of Radiographs With Use of the Modified Lateral Pillar and Stulberg Classifications. Journal of Bone and Joint Surgery. 2004. PMID 15466719

›Foundational paper defining lateral pillar and Stulberg classification systems

›Larson AN, Sucato DJ, Herring JA, et al. A Prospective Multicenter Study of Legg-Calvé-Perthes Disease: Functional and Radiographic Outcomes of Nonoperative Treatment at a Mean Follow-Up of Twenty Years. Journal of Bone and Joint Surgery. 2012. PMID 22488614

›Twenty-year follow-up data on non-operative treatment outcomes

›Herring JA, Kim HKW, Jo C, Hadden WJ. A Unifying Radiographic Description of Legg-Calvé-Perthes Disease at Skeletal Maturity: The HAT Classification. Journal of Bone and Joint Surgery. 2025. PMID 40729461

›2025 paper introducing the Head-Acetabulum-Trochanter classification system

›Cook PC. Transient Synovitis, Septic Hip, and Legg-Calvé-Perthes Disease: An Approach to the Correct Diagnosis. Pediatric Clinics of North America. 2014. PMID 25439014

›Clinical decision framework for differentiating the three main causes of pediatric hip pain

Landmark Trials and Systematic Reviews

›Kim HK. Legg-Calvé-Perthes Disease. Journal of the American Academy of Orthopaedic Surgeons. 2010. PMID 21041802

›Comprehensive review of pathophysiology, staging, and therapeutic principles

›Zoabi M, Kvatinsky N, Shavit I. Evaluation of a Point-of-Care Ultrasonography Decision-Support Algorithm for the Diagnosis of Transient Synovitis in the Pediatric ED. JAMA Network Open. 2021

›POCUS algorithm for transient synovitis: sensitivity 98%, specificity 92% in pediatric ED

›Huhnstock S, Wiig O, Merckoll E, Svenningsen S, Terjesen T. The Modified Stulberg Classification Is a Strong Predictor of the Radiological Outcome 20 Years After Perthes Disease. Bone and Joint Journal. 2021. PMID 34847712

›Twenty-year validation of Stulberg classification as predictor of radiological outcome

›Demirel M, Sulejmani I, Gokceoglu Y, et al. Radiographic and Functional Outcomes of Shelf Acetabuloplasty Versus Conservative Management in Legg-Calvé-Perthes Disease. International Orthopaedics. 2025. PMID 40560220

›Comparative study showing superior isokinetic hip muscle strength with shelf acetabuloplasty

›Melin L, Rendek Z, Hailer YD. Recommendations for Physiotherapy and Physical Activity for Children With LCPD: A Survey of Pediatric Orthopedic Surgeons and Physiotherapists in Sweden. Acta Orthopaedica. 2023. PMID 37592869

›Expert survey supporting activity modification over immobilization; defines safe activities

›Jobi-Odeneye AO. Acute Bacterial Arthritis in Children: Guidelines From the Pediatric Infectious Diseases Society and IDSA. American Family Physician. 2024. PMID 39700378

›Current PIDS/IDSA guidelines for septic arthritis diagnosis and management in children

Evidence & Review

Evidence & Review