1. Department of Joint Surgery and Sports Medicine, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University , 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8519, Japan
2. Department of Orthopedic Surgery, Dokkyo Medical University, Saitama Medical Center , 2-1-50 Minamikoshigaya, Koshigaya-shi 343-8555, Saitama, Japan
3. Department of Orthopedic Surgery, Tokyo Medical and Dental University Graduate School of Medicine , 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8519, Japan