1. Department of Orthopedic Surgery, Faculty of Medicine, Saga University, Saga, Japan
2. Research Center for Arthroplasty, Faculty of Medicine, Saga University, Saga, Japan
3. Department of Orthopaedic Surgery, JCHO Saga Central Hospital, Saga, Japan
4. Department of Orthopedic Surgery, Shiroishi Kyoritsu Hospital, Saga, Japan