Kensuke Ochi1, Katsunori Ikari2, Shigeki Momohara2. 1. Department of Orthopedic Surgery, Institute of Rheumatology, Tokyo Women's Medical University; Japan Department of Orthopedic Surgery, Keio University School of Medicine;Department of Orthopedic Surgery, Institute of Rheumatology, Tokyo Women's Medical University, Shinjuku, Tokyo, Japan. ochi@1998.jukuin.keio.ac.jp. 2. Department of Orthopedic Surgery, Institute of Rheumatology, Tokyo Women's Medical University; Japan Department of Orthopedic Surgery, Keio University School of Medicine;Department of Orthopedic Surgery, Institute of Rheumatology, Tokyo Women's Medical University, Shinjuku, Tokyo, Japan.