1. Engineering Research Center for Biomedical Materials of Ministry of Education
2. East China University of Science and Technology
3. Shanghai 200237
4. P. R. China
5. Key Laboratory for Ultrafine Materials of Ministry of Education
6. School of Materials Science and Engineering
7. Department of Orthopedics
8. Affiliated Sixth People's Hospital
9. Shanghai Jiaotong University
10. Shanghai 200032
11. China