^○Naoki Suenaga¹, Naomi Oizumi¹, Chika Yoshioka¹, Shintaro Yamane¹, Isoya Goya¹, Naoki Miyoshi² (1.Orthopaedic Hokushin Hospital Sapporo, Japan, 2.Dept of Orthopapedic Surgery, Asahikawa Medical University)

^○Markus Scheibel (Charité - Universitaetsmedizin Berlin, Germany)

^○Thomas Quin Throckmorton (University of Tennessee-Campbell Clinic, USA)

^○George S. Athwal (University of Western Ontario in London, Canada)