1. An account is given of a family in which five members in three generations were affected by osteochondritis involving the hips, in three cases bilaterally.

2. One patient showed aseptic osseous necrosis of the epiphyses of the ankles and fingers.

3. The differential diagnosis between Perthes' disease and multiple epiphysial dysplasia is discussed, but it is not certain into which category these patients fall.

4. The assistance of a family history and skeletal survey in diagnosis is illustrated.