Subtrochanteric femoral shortening osteotomy. A, Initial femoral osteotomy is made at subtrochanteric level. B, Proximal femur is retracted to expose level of true acetabulum, and socket is placed in anatomic location. C, Proximal femoral fragment is prepared, and trial reduction is done with femoral component placed only in proximal fragment. Traction is applied to distal femoral fragment, and overlapping portion of femur is resected. D, Femoral fragments are reduced, and excessive femoral anteversion is corrected. Femoral component provides intramedullary fixation of osteotomy.