1. Department of Joint Surgery Center, Yokosuka Municipal Hospital, Yokosuka city, Kanagawa, Japan
2. Department of Orthopaedic Surgery, Fukuoka University Faculty of Medicine, Fukuoka, Japan
3. Department of Joint Surgery Center, Saiwaitsurumi Hospital, Yokosuka city, Kanagawa, Japan
4. Department of Rehabilitation, Yokosuka Municipal Hospital, Yokosuka city, Kanagawa, Japan