1. Department of Orthopaedics Shanghai Jiao Tong University Affiliated Sixth People's Hospital Shanghai 200233 China
2. Shanghai Key Laboratory for Prevention and Treatment of Bone and Joint Diseases Shanghai Institute of Traumatology and Orthopaedics Ruijin Hospital Shanghai Jiao Tong University School of Medicine Shanghai 200025 China
3. Department of Orthopaedics National Clinical Research Center for Geriatric Disorders Central South University Xiangya Hospital Changsha 410008 China