Transtrochanteric rotational osteotomy of the femoral head was carried out on three cases of posttraumatic osteonecrosis. Injuries of the hip joint were femoral neck fracture on two cases, and central dislocation with acetabular fracture on one case. The age of the each patient was 16, 20, 12 years old at the trauma, and 18, 22, 13 years old at the osteotomy. Findings of the osteonecrosis of the femoral head appeared at 12, 9, and 10 months after the trauma on each case.
Preoperative classification of femoral head necrosis according to Sugioka was grade II in every patients. Intact area of the femoral head on the lateral view of the preoperative roentgenogram was about one third or more on each case. Ratio of transposed intact articular surface of the femoral head after the osteotomy to the acetabular weight bearing area was 100% on each case.
Postoperative follow-up period is 51, 39, and 22 months on each case. Progressive collapse of the femoral head has not yet seen. The assessment score of hip joint function in Japanese Orthopaedic Association is 88, 88, and 90 on each case.