- Commonly in boys 5-15yo where a segment of cartilage of the femoral condyle undergoes necrosis, and eventually separates to from an intra-articular loose body
- SSx
- pain – dull ache worse with activity, improves with rest
- Persistent or intermittent joint effusion
- restricted ROM
- Locations:
- knee (most common) – posterolateral aspect of medial femoral condyle (70% of lesions in knee)
- capitellum of humerus
- talus
- Suspect in children if knee pain persists, particularly in the presence of an effusion
- younger age correlates with better prognosis, Adult form worse prognosis
- open distal femoral physes are the best predictor of successful non-operative management
- Nonoperative:
- restricted weight bearing and bracing: 50-75% will heal without fragmentation
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