1. State Key Laboratory of High Performance Ceramics and Superfine MicrostructureShanghai Institute of CeramicsChinese Academy of Sciences Shanghai 200050 P. R. China
2. Department of Orthopedic SurgeryShanghai Jiao Tong University Affiliated Sixth People’s Hospital Shanghai 200233 P. R. China
3. Department of Orthopedics, No. 455 Hospital of PLAThe Second Military Medical University Shanghai 200052 P. R. China