Yao S Wu1, Lin W Chen2, Nai F Tian3, Zhi J Pan2, Yan Lin3. 1. Department of Orthopaedic Surgery, Second Affiliated Hospital, School of Medicine, Zhejiang University, 88 Jiefang Road, Hangzhou, China; Department of Orthopaedic Surgery, Second Affiliated Hospital of Wenzhou Medical College, 109 Xueyuan Xi Road, Wenzhou, China. 2. Department of Orthopaedic Surgery, Second Affiliated Hospital, School of Medicine, Zhejiang University, 88 Jiefang Road, Hangzhou, China. 3. Department of Orthopaedic Surgery, Second Affiliated Hospital of Wenzhou Medical College, 109 Xueyuan Xi Road, Wenzhou, China.