**Author details**

Koichi Yano1\*, Takashi Namikawa2 , Takuya Uemura3 , Yasunori Kaneshiro1 and Kunio Takaoka4

\*Address all correspondence to: koichiyano@hotmail.com

1 Department of Orthopaedic Surgery, Seikeikai Hospital, Sakai city, Japan

2 Department of Orthopaedic Surgery, Osaka City General Hospital, Osaka city, Japan

3 Department of Orthopaedic Surgery, Osaka City University Graduate School of Medicine, Osaka city, Japan

4 Department of Orthopaedic Surgery, Nishinomiya Watanabe Hospital, Nishinomiya city, Japan
