1. Department of Sports Medicine; Xi-Jing Hospital, the Fourth Military Medical University; Xi'an 710032 Shaanxi Province China
2. Department of Orthopaedic Surgery; the 82nd Hospital of PLA; Huai'an 223001 Jiangsu Province China
3. Department of Orthopaedic Oncology; Xi-Jing Hospital, the Fourth Military Medical University; Xi'an 710032 Shaanxi Province China