Fig. 7

Volume and distribution of the femoral head necrosis area at the 6th month after the operation. Anterior superior medial (ASM), posterior superior medial (PSM), anterior superior lateral (ASL), posterior superior lateral (PSL), anterior inferior medial (AIM), posterior inferior medial (PIM), anterior inferior lateral (AIL), posterior inferior lateral (PIL). AFHN: alcoholic femoral head necrosis; SIFHN: steroid-induced femoral head necrosis; IFHN: idiopathic femoral head necrosis