[1] Seikeikai Hosp, Orthopaed Surg, Sakai, Japan
[2] Osaka Metropolitan Univ, Orthopaed Surg, Sch Med, Osaka, Japan
[3] Osaka Metropolitan Univ, Ctr Senile Degenerat Disorders CSDD, Orthopaed Surg, Sch Med, Osaka, Japan
[4] Shirahama Fdn Hlth & Welf, Search Inst Bone & Arthrit Dis SINBAD, Orthopaed Surg, Wakayama, Japan
[5] Osaka City Gen Hosp, Orthopaed Surg, Osaka, Japan
[6] Osaka Saiseikai Nakatsu Hosp, Social Welf Org Saiseikai Imperial Gift Fdn Inc, Orthopaed Surg, Osaka, Japan