Familial osteochondritis dissecans.

Two examples of familial osteochondritis dissecans are described, one affecting a mother and daughter and the other a father and son. The mother and daughter both have genu valgum and are short statured. This combination of features has not been reported previously. Radiographs of lesions affecting knee, elbow, hip and ankle joints demonstrate the wide spectrum of radiological abnormality that can occur in this condition.