Y Hamada1, N Hibino2, A Kobayashi3. 1. Department of Orthopedics, Tokushima Prefectural Central Hospital, Tokushima, Japan handhamada@hotmail.co.jp. 2. Hand Center, Tokushima Naruto Hospital, Tokushima, Japan. 3. Center for Clinical Education, Tokushima Prefectural Central Hospital, Tokushima, Japan.