Steer Joshua W, Worsley Peter R, Browne Martin, Dickinson Alex
Bioengineering Science Research Group, School of Engineering, Faculty of Engineering and Physical Sciences, University of Southampton, Southampton, UK.
Clinical Academic Facility, School of Health Sciences, Faculty of Environment and Life Sciences, University of Southampton, Southampton, UK.
Prosthet Orthot Int. 2021 Apr 1;45(2):138-146. doi: 10.1177/0309364620967781.
Finite element modelling has long been proposed to support prosthetic socket design. However, there is minimal detail in the literature to inform practice in developing and interpreting these complex, highly nonlinear models.
To identify best practice recommendations for finite element modelling of lower limb prosthetics, considering key modelling approaches and inputs.
Computational modelling.
This study developed a parametric finite element model using magnetic resonance imaging data from a person with transtibial amputation. Comparative analyses were performed considering socket loading methods, socket-residuum interface parameters and soft tissue material models from the literature, to quantify their effect on the residuum's biomechanical response to a range of parameterised socket designs.
These variables had a marked impact on the finite element model's predictions for limb-socket interface pressure and soft tissue shear distribution.
All modelling decisions should be justified biomechanically and clinically. In order to represent the prosthetic loading scenario in silico, researchers should (1) consider the effects of donning and interface friction to capture the generated soft tissue shear stresses, (2) use representative stiffness hyperelastic material models for soft tissues when using strain to predict injury and (3) interrogate models comparatively, against a clinically-used control.
长期以来，人们一直提议使用有限元建模来辅助假肢接受腔设计。然而，文献中关于开发和解释这些复杂的高度非线性模型的实践指导细节极少。
考虑关键建模方法和输入因素，确定下肢假肢有限元建模的最佳实践建议。
计算建模。
本研究利用一名经胫骨截肢者的磁共振成像数据开发了一个参数化有限元模型。考虑文献中的接受腔加载方法、接受腔 - 残肢界面参数和软组织材料模型进行对比分析，以量化它们对残肢对一系列参数化接受腔设计的生物力学响应的影响。
这些变量对有限元模型预测的肢体 - 接受腔界面压力和软组织剪切分布有显著影响。
所有建模决策都应在生物力学和临床方面具有合理性。为了在计算机模拟中呈现假肢加载情况，研究人员应：（1）考虑穿戴和界面摩擦的影响，以捕捉产生的软组织剪应力；（2）在使用应变预测损伤时，对软组织使用具有代表性的刚度超弹性材料模型；（3）与临床使用的对照模型进行对比分析。
