Fig. 2

Method of joint space measurement by multiplanar reconstruction computed tomography (CT). The calculations of the joint space (JS) were performed between the surface of the cortical bone of the acetabulum and that of the femoral head on the perpendicular line from the centre of the femoral head (H). The appropriate point of sagittal and coronal views was determined at the slice where the size of the femoral head was most prominent. The upper row indicates the coronal view of mCT, and the lower one indicates the sagittal view. The wickets indicate a wider view of mCTs