Tokyo Institute of Technology - Department of Materials Science and Engineering, Tokyo Institute of Technology - Department of Materials Science and Engineering, Tokyo Institute of Technology - Department of Materials Science and Engineering, Tokyo Medical and Dental University, Graduate School - Section of Orthopedics and Spinal Surgery, Tokyo Medical and Dental University, Graduate School - Section of Orthopedics and Spinal Surgery, Tokyo Medical and Dental University, Graduate School - Section of Orthopedics and Spinal Surgery and Tokyo Institute of Technology - Department of Materials Science and Engineering