1. Department of OrthopedicsThe Second Hospital of Jilin University Changchun 130041 P. R. China
2. Department of OrthopedicsChina‐Japan Union Hospital of Jilin University Changchun 130033 P. R. China
3. Key Laboratory of Polymer EcomaterialsChangchun Institute of Applied ChemistryChinese Academy of Sciences Changchun 130022 P. R. China
4. Department of StomatologyThe Second Hospital of Jilin University Changchun 130041 P. R. China