1. In3vestigation performed at the Department of Orthopaedic Surgery, Kumamoto University School of Medicine, Kumamoto, Japan, From the Department of Orthopaedic Surgery, Kumamoto University School of Medicine, 1-1-1 Honjo, Kumamoto, 860-8556, Japan, Kataoka Orthopaedic & Anesthetic Clinic, Japan, Kumamoto Rehabilitation Hospital, Japan and Kumamoto Orthopaedic Hospital, Japan