[1] Sapporo Med Univ, Dept Orthopaed Surg, South 1 West 17,Chuo Ku, Sapporo, Hokkaido 0608556, Japan
[2] Osaka Kosei Nenkin Hosp, Dept Orthopaed Surg, 4-2-78 Fukushima, Osaka, Fukushima 5530003, Japan
[3] Osaka Yukioka Med Coll, Dept Phys Therapy, 1-1-41 Sojiji, Ibaraki 5670801, Japan
[4] Matsumoto Med Clin, 3-16-28 Mizuo, Ibaraki 5670891, Japan
[5] Osaka Yukioka Med Coll, Dept Phys Therapy, 1-1-41 Soujiji, Osaka, Ibaraki, Japan