1. Postgraduate Training Base Jinzhou Medical University and The Fourth Medical Centre Chinese PLA General Hospital Beijing 100048 China
2. Department of Stomatology the Fourth Medical Centre Chinese PLA General Hospital Beijing 100048 China
3. State Key Laboratory of Tribology in Advanced Equipment Beijing 100084 China
4. Department of Mechanical Engineering Tsinghua University Beijing 100084 China
5. Senior Department of Orthopedics the Fourth Medical Centre PLA General Hospital Beijing 100048 China
6. Beijing Engineering Research Center of Orthopedics Implants Beijing 100048 China