[Hip joint deformity caused by osteochondrosis in the course of treatment of congenital dysplasia of the hip].

A series of 73 patients with avascular necrosis complicating surgical or nonsurgical treatment for congenital hip dysplasia is presented. The femoral head, neck and subcapital growth plate has been damaged in all cases. A-P radiographs of proximal femur revealed three types of growth disturbances: lateral, medial and total one. Localization of growth plate damage determined the type of growth disturbances. Mutual features for all types were: shortening of the femoral neck and growth disproportion between femoral head and greater trochanter. In 43 hips the greater trochanter grew over the femoral head and constituted the most proximal part of the femur (trochanter altus). Growth disturbances of the acetabulum coexisted (primary and secondary acetabular dysplasia). Radiological parameters of deformed hips have been compared with normal values.