1 Department of Orthopaedic Surgery, Teikyo University School of Medicine, 2-11-1, Kaga, Itabashi, Tokyo 173-8605, Japan. Electronic address: yshimozono@med.teikyo-u.ac.jp.
2 Department of Orthopaedic Surgery, Teikyo Institute of Sports Science and Medicine, Teikyo University, 2-11-1, Kaga, Itabashi, Tokyo 173-8605, Japan. Electronic address: mtakao@med.teikyo-u.ac.jp.
3 Department of Orthopaedic Surgery, Teikyo University School of Medicine, 2-11-1, Kaga, Itabashi, Tokyo 173-8605, Japan. Electronic address: miyamoto@med.teikyo-u.ac.jp.
4 Department of Orthopaedic Surgery, Teikyo Institute of Sports Science and Medicine, Teikyo University, 2-11-1, Kaga, Itabashi, Tokyo 173-8605, Japan. Electronic address: youichi_yasui_41@yahoo.co.jp.
5 Department of Orthopaedic Surgery, Teikyo University School of Medicine, 2-11-1, Kaga, Itabashi, Tokyo 173-8605, Japan. Electronic address: hkawano-tky@umin.net.