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首页> 外文期刊>Journal of Biomechanics >A subject-specific pelvic bone model and its application to cemented acetabular replacements.
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A subject-specific pelvic bone model and its application to cemented acetabular replacements.

机译：特定对象的骨盆骨模型及其在骨水泥髋臼置换中的应用。

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摘要

A subject-specific three-dimensional finite element (FE) pelvic bone model has been developed and applied to the study of bone-cement interfacial response in cemented acetabular replacements. The pelvic bone model was developed from CT scan images of a cadaveric pelvis and validated against the experiment data obtained from the same specimen at a simulated single-legged stance. The model was then implanted with a cemented acetabular cup at selected positions to simulate some typical implant conditions due to the misplacement of the cup as well as a standard cup condition. For comparison purposes, a simplified FE model with homogeneous trabecular bone material properties was also generated and similar implant conditions were examined. The results from the homogeneous model are found to underestimate significantly both the peak von Mises stress and the area of the highly stressed region in the cement near the bone-cement interface, compared with those from the subject-specific model. Non-uniform cement thickness and non-standard cup orientation seem to elevate the highly stressed region as well as the peak stress near the bone-cement interface.
机译：已经开发了特定于受试者的三维有限元（FE）骨盆骨模型，并将其应用于骨水泥髋臼置换中骨水泥界面反应的研究。盆骨模型是通过尸体骨盆的CT扫描图像开发的，并以模拟的单腿姿势从相同标本获得的实验数据进行了验证。然后，在选定的位置将模型固定的髋臼杯植入模型中，以模拟由于杯的错位以及标准的杯状况而导致的一些典型植入状况。为了进行比较，还生成了具有均一的小梁骨材料特性的简化FE模型，并检查了相似的植入条件。与对象特定模型相比，均质模型的结果被发现大大低估了冯·米塞斯峰的峰值和骨水泥界面附近水泥中高应力区域的面积。水泥厚度不均匀和非标准的杯形方向似乎会升高高应力区域以及骨水泥界面附近的峰值应力。

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