539 CR型とPS型モバイルベアリング式人工膝関節の歩行時における動態比較(S09-1 関節のバイオメカニズム(1),S09 関節のバイオメカニズム)

概要

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When mobile bearing artificial knee joints are designed, little attention has been paid for the dynamic motion of polyethylene insert. Since knee movement involves a complicated combination of translation and rotation, adequate motion analysis is necessary for estimating the wear of knee prosthesis and improving the design of artificial knee joint. We, therefore, used a 6-DOF motion simulator and analyzed the motion of the polyethylene insert on the artificial knee joint with a mobile bearing. A couple of knee joints were subjected to static and dynamic (0.5Hz and 1.0Hz) walking conditions, respectively. The motion analysis revealed that the design of knee prosthesis greatly influenced on the motion of insert, which would be induced by friction and contacts between the polyethylene tibial post and femoral component. This study suggests that the dynamic motion analysis combined with the 6-DOF motion simulator was useful for evaluating the tribological characteristics and functions of artificial knee joint. Therefore the 6-DOF motion simulator would contribute to improvement of TKA design.
2006-09-15