The twelve patients, whose ages ranged from 18 years to 87 years, 5 of males and 7 of females, were admitted to Department of Orthopaedic Surgery of Korea University Hospital from January, 1978 to November, 1979 for total hip replacement surgery: 5 cases of the post traumatic femur neck fracture, 2 case of idiopathic aseptic necrosis, 2 cases of post infectious bony ankylosis of the hip, 1 case of sequele of Legg-Perthes disease, 1 case of secondary osteoarthritis secondary due to congenital acetabular dysplasia and acetabular dysplasia secondary to old infection. For these cases, the authors carrid out the surgery of total hip replacement through the new method of anterolateral “S” approach,combined with innominate osteotomy and autogenous bone graft of resected femoral head. Regular type of eleven Muller prosthesis and one Charnley prosthesis were adequately inserted in the enlarged acetabular socket. The results obtained are as follows: 1. This approach had the following advantages; such as the sufficient exposure of the operative field without the greater trochanteric osteotomy, the shortened operative time, the decreased amount of blood loss and the easy widening of the acetabular socket during the surgery. 2. There was no difficulty to perform simultaneously innominate osteotomy with autogenous bone graft of resected femoral head to the ilium during the same operative period. 3. The release of the rectus femoris from the anteroinferior iliac spine does not cause any weakness of the knee extension. 4. In all 12 patients, the end results of the function after this new method revealed saticefactory.