Ke Lu1, Yi-Jun Gao2. 1. Department of Orthopaedics, Affiliated Kunshan Hospital of Jiangsu University, No. 91 West of Qianjin Road, Suzhou, 215300, Jiangsu, China. 2. Department of Orthopaedics, Affiliated Kunshan Hospital of Jiangsu University, No. 91 West of Qianjin Road, Suzhou, 215300, Jiangsu, China. gaoyijun2010@163.com.