TKA6自由度トライボシミュレータを使用したMOBILE BEARING TKAの力学的評価(機械力学,計測,自動制御)

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Rapid aging of society has aroused a great interest in the disorder that affects the function of knee. This painful and crippling condition requires total knee arthroplasty (TKA) frequently. However, mechanism of wear generation in polyethylene is still unravel because knee movement during normal function involves a complex set of coupled translations and rotations. This study was therefore aimed to determine the kinematics of polyethylene insert on the mobile bearing TKA during walking using artificial knee joint simulator. Mobile bearing artificial knee joint with (posterior-substituting (PS) type) and without (cruciate-retaining (CR) type) cam/post were used for the experiment. Motion of the polyethylene insert mounted on tibial component was measured by the coordinate of markers on the insert and six degrees of freedom motion simulator during walking motion. In addition, the polyethylene insert was liquored lubricant among measurement. Both the static analysis at each time step and dynamic analysis during the gait cycle were performed respectively. The distribution of contact pressure between femoral component and polyethylene insert showed different results by setting it from static condition to dynamic conditions (0.5Hz and 1.0Hz). Dynamic analysis revealed that the cam of femoral component in PS type dynamically contacted on the post of polyethylene insert, which made the polyethylene insert detached from the motion of polyethylene insert in mobile bearing TKA. Additionally, it would contribute to the improvement of TKA design.
一般社団法人日本機械学会の論文
2007-12-25

TKA6自由度トライボシミュレータを使用したMOBILE BEARING TKAの力学的評価(機械力学,計測,自動制御)

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