Yu Mori1, Naoko Mori2, Toshimi Aizawa3. 1. Department of Orthopaedic Surgery, Tohoku University Graduate School of Medicine, 1-1 Seiryo-machi, Aoba-Ku, Sendai, Miyagi, 980-8574, Japan. yu-mori@med.tohoku.ac.jp. 2. Department of Diagnostic Radiology, Tohoku University Graduate School of Medicine, 1-1 Seiryo-machi, Aoba-Ku, Sendai, Miyagi, 980-8574, Japan. 3. Department of Orthopaedic Surgery, Tohoku University Graduate School of Medicine, 1-1 Seiryo-machi, Aoba-Ku, Sendai, Miyagi, 980-8574, Japan.