Wei Chen1,2,3, Yingze Zhang4,5,6,7. 1. Department of Orthopedic Surgery, The Third Hospital of Hebei Medical University, Shijiazhuang, Hebei, 050051, People's Republic of China. 2. Key laboratory of biomechanics of Hebei Province, Shijiazhuang, Hebei, 050051, People's Republic of China. 3. Hebei Institute of Orthopaedics and Traumatology, The Third Hospital of Hebei Medical University, Shijiazhuang, Hebei, 050051, People's Republic of China. 4. Department of Orthopedic Surgery, The Third Hospital of Hebei Medical University, Shijiazhuang, Hebei, 050051, People's Republic of China. dryzzhang@126.com. 5. Key laboratory of biomechanics of Hebei Province, Shijiazhuang, Hebei, 050051, People's Republic of China. dryzzhang@126.com. 6. Hebei Institute of Orthopaedics and Traumatology, The Third Hospital of Hebei Medical University, Shijiazhuang, Hebei, 050051, People's Republic of China. dryzzhang@126.com. 7. Chinese Academy of Engineering, Beijing, 100088, People's Republic of China. dryzzhang@126.com.