Three-dimensional shape optimization of a cemented hip stem and experimental validations
Three-dimensional shape optimization of a cemented hip stem and experimental validations
复制标题
DOI：
10.1007/s10047-014-0792-y
复制
发表时间：
2015-03-01
影响因子：
1.3
通讯作者：
Ito, Hiroshi
中科院分区：
文献类型：
--
作者：
Higa, Masaru;Tanino, Hiromasa;Ito, Hiroshi
本研究采用有限元 (FE) 分析，结合优化程序和体外水泥应力实验测量，提出了新型优化的杆几何形状，在水泥中具有低应力值。我们首先使用三维有限元分析结合形状优化技术优化了现有的阀杆几何形状。骨水泥柄设计中最重要的因素之一是减少骨水泥中的应力。因此，在优化研究中，我们通过改变茎的几何形状来最小化生理加载条件下水泥地幔中的最大拉伸主应力。下一步，制造了优化的柄和现有的柄，以验证数值模型的有用性和体外优化的结果。在实验研究中，应变计嵌入水泥地幔中，以测量与茎相邻的水泥地幔中的应变。实验研究的总体趋势与数值研究的结果非常吻合，我们能够在形状优化和应变仪测量中将最大应力降低 50% 以上。因此，我们可以使用实验模型验证数值模型的有用性和优化结果。本研究中采用的优化是开发新阀杆设计的有用方法。
This study proposes novel optimized stem geometry with low stress values in the cement using a finite element (FE) analysis combined with an optimization procedure and experimental measurements of cement stress in vitro. We first optimized an existing stem geometry using a three-dimensional FE analysis combined with a shape optimization technique. One of the most important factors in the cemented stem design is to reduce stress in the cement. Hence, in the optimization study, we minimized the largest tensile principal stress in the cement mantle under a physiological loading condition by changing the stem geometry. As the next step, the optimized stem and the existing stem were manufactured to validate the usefulness of the numerical models and the results of the optimization in vitro. In the experimental study, strain gauges were embedded in the cement mantle to measure the strain in the cement mantle adjacent to the stems. The overall trend of the experimental study was in good agreement with the results of the numerical study, and we were able to reduce the largest stress by more than 50 % in both shape optimization and strain gauge measurements. Thus, we could validate the usefulness of the numerical models and the results of the optimization using the experimental models. The optimization employed in this study is a useful approach for developing new stem designs.