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J Pediatr Orthop. 1994 Jul-Aug;14(4):513-5.

Acute patellar dislocation in children: incidence and associated osteochondral fractures.

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Department of Surgery, Aurora Hospital, Helsinki, Finland.


In a prospective two-year study on urban (city of Helsinki) Finnish children, 72 acute patellar dislocations were observed. The calculated annual incidence rate was 43/100,000 in children under 16 years. A total of 28 knees (39%) had associated osteochondral fractures. These fractures comprised 15 capsular avulsions of the medial patellar margin and 15 loose intra-articular fragments detached from the patella and/or lateral femoral condyle. The intra-articular fragments were found only after spontaneous relocation of the patella. The femoral fracture constantly involved the edge of the articular surface in the middle third of the condylar arc.

[Indexed for MEDLINE]

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