1. Hand and Microsurgery Center, Department of Orthopaedic Surgery, Seikeikai Hopital, Osaka, Japan;
2. Department of Orthopaedic Surgery, Osaka City General Hospital, Osaka, Japan;
3. Department of Orthopaedic Surgery, Yodogawa Christian Hospital, Osaka, Japan;
4. Department of Orthopaedic surgery, Baba Memorial Hospital