Artificial replacement of the hip joint in severe coxarthroses secondary to acetabular dysplasia.

The reconstruction of hip joints is problematic in cases of subluxation coxarthrosis, since the dysplastic acetabulum's lack of depth does not primarily allow reliable anchorage of an acetabular prosthesis component. Since enlargement of the acetabulum by fraising is ruled out on biomechanical grounds, a suitable bed for the implant can only be created by reconstructing the roof of the acetabulum. Laterally supported osteoplasty has proved to be a suitable method for repairing dysplastic acetabular defects, involving screwing of autogenic or allogenic grafts firmly onto the acetabular margin. The radiological and clinical results of 70 hips followed up confirm the efficiency of the endoprosthetic acetabulum implanted by this method in cases of marked dysplastic coxarthrosis.