Sui-Yi Chao1, Tai-Chung Chern2, I-Ming Jou1, Yao-Lung Kuo3. 1. Department of Orthopedics, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan. 2. Chern Tai-Chung Orthopedic Clinics, Ping-Tung, Taiwan. 3. Department of Surgery, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan and Dou-Liou Branch, Tainan, Taiwan.