Fig. 5.

a) Preoperative anteroposterior (AP) radiograph showing the right hip of a 33-year-old man with type C1 osteonecrosis of the femoral head. b) A preoperative AP radiograph in maximum hip abduction showing coverage of more than one-third of the weight-bearing area with an intact articular surface. c) Postoperative AP radiograph obtained one year after curved intertrochanteric varus osteotomy (CVO) showing restoration of the collapsed spheroid head. d) An AP radiograph showing a lack of osteoarthritic progression and remodelled necrotic area ten years after surgery.