Zuyun Yan1, Xinqiao Tang1, Xiaoming Chen1, Zhong Liu2. 1. Department of Orthopedics, Xiangtan Central Hospital, Clinical Practice, Base of Central South University, 120 Heping Road, Xiangtan, 411100, Hunan, China. 2. Department of Orthopedics, Xiangtan Central Hospital, Clinical Practice, Base of Central South University, 120 Heping Road, Xiangtan, 411100, Hunan, China. liuzhwangf@163.com.