Preoperative X-ray templating All data measurements were made on Neusoft PACS. An anteroposterior (AP) positive view of the pelvis was obtained with both lower extremities internally rotated at 15°. For LLD measurement, a reliable method is to measure the vertical distance from the line connecting the lower edge of the two teardrops to the innermost edge of the small rotor. The difference between the measured values of the two sides is the LLD. OD is measured by the distance between the axis of the femur and the center of the femoral head. In the figure, the LLD was 9.58 mm, the OD on the right was 46.79 mm, and the OD on the left was 43.58 mm.