Jian Zhuang1, Yuchun Li2. 1. Department of Sport Medicine, Qilu Hospital of Shandong University, Qingdao, 266035, Shandong, China. 2. Department of Bone Tumor, Qilu Hospital of Shandong University, Qingdao, 266035, Shandong, China. haibosl201@sohu.com.