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Legg-Calvé-Perthes disease — MCCQE Part 1 MCQ

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ModerateJoint PainLegg-Calvé-Perthes diseaseMCCQE Part 1

A 7-year-old boy has a limp and dull right hip pain x 6 weeks. Afebrile, well-appearing. XR: right femoral head flattening with subchondral fracture. Most likely diagnosis?

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Correct answer: B — Legg-Calvé-Perthes disease

Afebrile child 4-8 with insidious hip pain and femoral head AVN on XR = Perthes. Peak age 5-7, M>F. Prognosis depends on age and extent of head involvement. Younger (<6) = better prognosis.

Reference: Canadian Paediatric Orthopaedics