1 Department of Orthopaedic Surgery, Nagoya University Graduate School and School of Medicine, 65 Tsurumai, Showa, Nagoya 466-8550, Aichi, Japan
2 Orthopaedic Surgery, Aichi Cancer Center Aichi Hospital, 18 Kuriyado, Kake-machi, Okazaki City, Aichi, Japan
3 Orthopaedic Surgery, Nagoya Memorial Hospital, 4-305 Hirabari, Tenpaku-ku, Nagoya, Japan
4 Present address: Orthopaedic Surgery, Gifu Prefectural Tajimi Hospital, 5-161, Maehata, Tajimi, Gifu, Japan