Teruhisa Mihata,*yz§ MD, PhD, Rei Morikura,y MD, Akihiko Hasegawa,y MD, PhD, Kunimoto Fukunishi,y MD, Takeshi Kawakami,z MD, PhD, Yukitaka Fujisawa,y MD, PhD, Mutsumi Ohue,§ MD, and Masashi Neo,y MD, PhD Investigation performed at Department of Orthopedic Surgery, Osaka Medical College, Takatsuki, Osaka, Japan