T Takahata1, H Ikuma2, R Joko2, T Maehara2. 1. Department of Orthopaedic Surgery, Kagawa Rosai Hospital, 3-3-1 Joto-cho, 763-8502, Marugame, Japan. kmtooh@yahoo.co.jp. 2. Department of Orthopaedic Surgery, Kagawa Rosai Hospital, 3-3-1 Joto-cho, 763-8502, Marugame, Japan.