Wen-Feng Xiong1, Shou-Chao Du2, Shi-Min Chang3. 1. The Department of Orthopaedic Surgery, Yangpu Hospital, Tongji University School of Medicine, Shanghai 200090, People's Republic of China. Electronic address: xiongwenfengxxx@126.com. 2. The Department of Orthopaedic Surgery, Yangpu Hospital, Tongji University School of Medicine, Shanghai 200090, People's Republic of China. Electronic address: dushouchao@126.com. 3. The Department of Orthopaedic Surgery, Yangpu Hospital, Tongji University School of Medicine, Shanghai 200090, People's Republic of China. Electronic address: shiminchang11@aliyun.com.