* Corresponding authors

^a Orthopedic Institute, Soochow University, 708 Renmin Rd, Suzhou, Jiangsu 215006, P.R. China
E-mail: wgcui80@hotmail.com
Fax: +86-512-6778-1420
Tel: +86-512-6778-1420

^b Department of Orthopedics, The First Affiliated Hospital of Soochow University, 188 Shizi St, Suzhou, Jiangsu 215006, P.R. China

^c Department of Orthopaedics, Zhongda Hospital, Southeast University, 87 Ding Jia Qiao, Jiangsu, Nanjing 210009, China

^d Department of Arthroscopic Surgery, Shanghai Sixth People's Hospital, Shanghai Jiao Tong University, School of Medicine, 600 Yishan Road, Shanghai, P.R. China
E-mail: zhaojinzhongdoctor@163.com
Fax: +86-21-6470-1361
Tel: +86-21-6436-9181-5809

^e Center for Biomedical Engineering, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Cambridge, MA, USA