The posterior approach to hip replacement surgery is the ore traditional procedure offered to hip patients. During the more traditional posterior approach, the surgeon makes an incision along the back of the hip to the side of the leg to access the hip joint. The natural lining of the acetabulum and the top of the femur (thigh bone) is removed during surgery. The remaining preparation of the femur and acetabulum involves reshaping to allow solid, accurate alignment of the hip components. The femoral stem is inserted inside the thigh bone, and the acetabular shell is inserted inside the socket of the pelvis.