1. Research Department; KYOCERA Medical Corporation, 3-3-31 Miyahara; Yodogawa-ku Osaka 532-0003 Japan
2. Division of Science for Joint Reconstruction; Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo; Bunkyo-ku Tokyo 113-8655 Japan
3. Sensory and Motor System Medicine; Faculty of Medicine, The University of Tokyo, 7-3-1 Hongo; Bunkyo-ku Tokyo 113-8655 Japan
4. Department of Materials Engineering; School of Engineering, The University of Tokyo, 7-3-1 Hongo; Bunkyo-ku Tokyo 113-8656 Japan
5. Department of Orthopaedic Surgery; Saitama Medical University School of Medicine, 38 Morohongo, Moroyama-machi; Iruma-gun Saitama 350-0495 Japan