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首页> 外文期刊>Journal of Biomechanics >Long-term study of bone remodelling after femoral stem: a comparison between dexa and finite element simulation.
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Long-term study of bone remodelling after femoral stem: a comparison between dexa and finite element simulation.

机译：股骨干术后骨重塑的长期研究：dexa与有限元模拟的比较。

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摘要

A hip replacement with a cemented or cementless femoral stem produces an effect on the bone called adaptive remodelling, attributable to mechanical and biological factors. The objective of all of cementless prostheses designs has been to achieve a perfect transfer of loads in order to avoid stress-shielding, which produces an osteopenia. In order to quantify this, the long term and mass-produced study with dual energy X-ray absorptiometry (DEXA) is necessary. Finite element (FE) simulation makes possible the explanation of the biomechanical changes which are produced in the femur after stem implantation. The good correlation obtained between the results of the FE simulation and the densitometric study allow, on one hand, to explain from the point of view of biomechanical performance the changes observed in bone density in the long-term, where it is clear that these are due to a different transfer of load in the implanted model compared to the healthy femur; on the other hand, it validates the simulation model, in a way that it can be used in different conditions and at different time periods, to carry out a sufficiently precise prediction of the evolution of the bone density from the biomechanical behaviour in the interaction between the prosthesis and femur.
机译：用骨水泥或非骨水泥的股骨柄进行髋关节置换会对骨骼产生影响，称为适应性重塑，这归因于机械和生物学因素。所有非骨水泥假体设计的目的都是实现载荷的完美传递，以避免产生骨质减少的应力屏蔽。为了对此进行量化，需要使用双能X射线吸收仪（DEXA）进行长期且批量生产的研究。有限元（FE）模拟使对股骨柄植入后股骨产生的生物力学变化的解释成为可能。有限元模拟结果与光密度法研究之间获得的良好相关性，一方面可以从生物力学性能的角度解释长期观察到的骨密度变化，很明显，这些变化是由于与健康股骨相比，植入模型中的负荷转移不同;另一方面，它可以通过在不同条件下和不同时间段内使用仿真模型来验证仿真模型，以根据生物力学行为之间的相互作用对骨密度的演变进行足够精确的预测。假体和股骨。

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