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首页> 外文期刊>Journal of Biomechanics >Modelling the fibrous tissue layer in cemented hip replacements: experimental and finite element methods
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Modelling the fibrous tissue layer in cemented hip replacements: experimental and finite element methods

机译：骨水泥髋关节置换中的纤维组织层建模：实验和有限元方法

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The long-term fixation of cemented femoral components may be jeopardised by the presence of a fibrous tissue layer at the bone-cement interface. This study used both experimental and finite element (FE) methods to investigate the load transfer characteristics of two types of cemented hip replacements (Lubinus SPII and Muller-Curved) with a fibrous tissue layer. The experimental part investigated six stems of each type, where these were implanted in composite femurs with a specially selected silicone elastomer modelling the soft interfacial layer. Two fibrous tissue conditions were examined: a layer covering the full cement mantle, representing a revision condition; and a layer covering the proximal portion of the cement mantle, representing a non-revised implant with partial debonding and fibrous tissue formation. The FE method was used to model the full fibrous tissue layer condition, for both implants. The layer was modelled as a homogeneous, linearly isotropic material. A cross-comparison was performed of the experimental and FE findings. Agreement between experimental and FE models was verified to be within 15%. Varying the stiffness parameter of the FE soft tissue layer had little influence on the cortical bone strains, though had considerable effect on the cement strains. Stress shielding occurred for both stems under both fibrous tissue conditions, with the greatest reduction around the calcar. However, the cortical bone strains were generally larger than those for the equivalent well-fixed stems. The fibrous tissue layer was not found to increase the general strain pattern of the cement mantle, though localised regions of high stress were detected. (C) 2003 Elsevier Ltd. All rights reserved. [References: 28]
机译：骨水泥界面处存在纤维组织层可能会损害股骨骨水泥成分的长期固定。这项研究同时使用了实验方法和有限元（FE）方法，以研究两种具有纤维组织层的骨水泥型髋关节置换术（Lubinus SPII和Muller-Curved）的载荷传递特性。实验部分研究了每种类型的六个茎，将它们植入复合股骨中，并使用专门选择的有机硅弹性体模拟了软界面层。检查了两种纤维组织状况：覆盖整个水泥覆盖层的一层，代表翻新状况;以及一层覆盖了水泥套的近端部分，代表了一种未经修订的植入物，具有部分脱粘和纤维组织形成的特点。对于两种植入物，均采用有限元方法对整个纤维组织层状况进行建模。将该层建模为均匀的线性各向同性材料。对实验结果和有限元结果进行了交叉比较。实验模型和有限元模型之间的一致性被证实在15％以内。改变FE软组织层的刚度参数对皮质骨应变的影响很小，尽管对骨水泥应变影响很大。在两种纤维组织条件下，两个茎均发生了应力屏蔽，而在骨结周围的应力下降最大。但是，皮质骨的应变通常大于同等固定的茎的应变。尽管检测到局部高应力区域，但未发现纤维组织层增加水泥衬套的总体应变模式。 （C）2003 Elsevier Ltd.保留所有权利。 [参考：28]

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