1. a Department of Orthopaedic Surgery, Tokyo Medical University, Shinjuku-ku, 6-7-1 Nishishinjuku, 160-0023 Tokyo, Japan
2. b Ceramic Physics Laboratory & Research Institute for Nanoscience, RIN, Kyoto Institute of Technology, Sakyo-ku, Matsugasaki, 606-8585 Kyoto, Japan
3. c Department of Orthopaedic Surgery, Tokyo Medical University, Shinjuku-ku, 6-7-1 Nishishinjuku, 160-0023 Tokyo, Japan
4. d Ceramic Physics Laboratory & Research Institute for Nanoscience, RIN, Kyoto Institute of Technology, Sakyo-ku, Matsugasaki, 606-8585 Kyoto, Japan
5. e Ceramic Physics Laboratory & Research Institute for Nanoscience, RIN, Kyoto Institute of Technology, Sakyo-ku, Matsugasaki, 606-8585 Kyoto, Japan