Idiopathic osteonecrosis of the femoral condyle occurring in two sisters.

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Spontaneous osteonecrosis of the knee was described as a distinct entity in 1968 (Ahlbäck et al) . The etiology of this lesion remains unknown, although micro-trauma and vascular insufficiency have been suggested as causes.<BR>Typically the patient is a female in the sixth and seventh decade, sudden onset is characteristic, and the lesion occurs mainly on the medial femoral condyle. Radiographs show a subchondral radiolucency on the weight-bearing area with subsequent flattening, collapse and sclerosis.<BR>We report on idiopathic osteonecrosis of the femoral condyle occurring in two sisters.
日本関節病学会の論文