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首页> 外文期刊>Journal of Biomechanics >Backside nonconformity and locking restraints affect liner/shell load transfer mechanisms and relative motion in modular acetabular components for total hip replacement.
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Backside nonconformity and locking restraints affect liner/shell load transfer mechanisms and relative motion in modular acetabular components for total hip replacement.

机译：背面不整合和锁定约束会影响内衬/壳体的载荷传递机制以及模块化髋臼组件的相对运动，以进行全髋关节置换。

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摘要

Nonconformity between the polyethylene liner and the metal shell may exist in modular acetabular components by design, due to manufacturing tolerances, or from locking mechanisms that attach the polyethylene liner to the metal shell. Relative motion at the liner/shell interface has been associated with backside wear, which may contribute to osteolysis which has been clinically observed near screw holes. The purpose of this study was to investigate the effect of nonconformity and locking restraints on the liner/shell relative motion and load transfer mechanisms in a commercially available, metal-backed acetabular component with a polar fenestration. The finite element method was used to explore the hypothesis that backside nonconformity and locking restraints play important roles in long-term surface damage mechanisms that are unique to modular components, such as backside wear and liner extrusion through screw holes. The three-body quasi-static contact problem was solved using a commercially available explicit finite element code, which modeled contact between the femoral head, polyethylene liner, and the metal shell. Four sets of liner boundary conditions were investigated: no restraints, rim restraints, equatorial restraints, and both rim and equatorial restraints. The finite element model with a conforming shell predicted between 8.5 and 12.8 microm of incremental extrusion of the polyethylene through the polar fenestration, consistent with in vitro experiments of the same design under identical loading conditions. Furthermore, idealized rim and/or equatorial liner restraints were found to share up to 71% of the load across the liner/shell interface. Consequently, the results of this study demonstrate that backside nonconformity and locking restraints substantially influence backside relative motion as well as load transfer at the liner/shell interface.
机译：由于制造公差，或者由于将聚乙烯衬套附接到金属壳上的锁定机构，聚乙烯衬里和金属壳之间的不一致性可能在设计中存在于模块化髋臼组件中。衬里/壳体界面处的相对运动与背面磨损有关，这可能会导致骨溶解，临床上已在螺丝孔附近观察到骨溶解。这项研究的目的是研究在市售的带有金属窗的金属支撑髋臼组件中，不整合和锁定约束对衬套/壳体相对运动和载荷传递机制的影响。有限元方法用于探讨以下假设：背面不合格和锁定约束在模块化组件独有的长期表面损坏机制中起着重要作用，例如背面磨损和衬套通过螺钉孔的挤压。使用可商购的显式有限元代码解决了三体准静态接触问题，该代码模拟了股骨头，聚乙烯内衬和金属外壳之间的接触。研究了四套班轮边界条件：无约束，边缘约束，赤道约束以及边缘和赤道约束。带有合格壳的有限元模型预测，通过极性开窗将聚乙烯挤出的增量为8.5至12.8微米，这与相同设计在相同载荷条件下的体外实验一致。此外，发现理想的轮辋和/或赤道衬套约束可在整个衬套/壳体界面上分担多达71％的负载。因此，这项研究的结果表明，背面的不整合和锁定限制会实质性地影响背面的相对运动以及衬里/壳体界面处的载荷传递。

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