1. Department of Orthopaedic Surgery, Daini Osaka Police Hospital, Osaka, Japan.
2. Center for Sports Medicine, Daini Osaka Police Hospital, Osaka, Japan.
3. Department of Orthopaedic Surgery, Graduate School of Medicine, Osaka University, Osaka, Japan.
4. Department of Orthopaedic Surgery, JCHO Osaka Hospital, Osaka, Japan.
5. Department of Orthopaedic Surgery, Osaka Central Hospital, Osaka, Japan.