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Predicting Pressure Distribution Between Transfemoral Prosthetic Socket and Residual Limb Using Finite Element Analysis

机译：应用有限元分析预测股骨假体窝与残肢之间的压力分布

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In this study, a non-linear Finite Element (FE) model was created and analyzed to determine the pressure distribution between the residual limb and the prosthetic socket of a transfemoral amputee. This analysis was performed in an attempt to develop a process allowing healthcare providers and engineers to simulate the fit and comfort of transfemoral prosthetics to reduce the number of re-fittings needed for the amputees. The analysis considered the effects of interference due to insertion of the limb into the prosthesis, referred to as donning, and also the effects due to the body weight of the amputee. A non-linear finite element static implicit analysis method was utilized. This analysis implemented multiple finite element techniques, including geometric non-linearity due to large deflections, non-linear contacts due to friction between the contact surfaces of the residual limb and the socket, and non-linear hyper-elastic material properties for the residual limb’s soft tissue. This non-linear static analysis was carried out in two time-steps. The first step involved solving the interference fit analysis to study the pre-stresses developed due to the effect of donning. The donning process results in soft tissue displacement to accommodate the internal geometry of the prosthesis. In the second load application time-step, an additional load of half the person’s body weight was applied to the femur. The maximum normal stress (contact pressure) of 84 kPa was observed due to the combined effect of the donning procedure and body weight application, comparable to the studies performed by other researchers. The procedure developed through this work can be used by future researchers and prosthetic designers in understanding how to better design transfemoral prosthesis.
机译：在这项研究中，创建并分析了非线性有限元（FE）模型，以确定经股截肢者残肢与假体窝之间的压力分布。进行此分析是为了尝试开发一种过程，以允许医疗保健提供者和工程师模拟经股假体的贴合度和舒适度，以减少截肢者所需的重新贴合次数。该分析考虑了由于将肢体插入假体而引起的干扰影响（称为穿用），以及因截肢者的体重而产生的影响。利用了非线性有限元静态隐式分析方法。该分析实施了多种有限元技术，包括由于大挠度导致的几何非线性，由于残肢和承窝的接触表面之间的摩擦导致的非线性接触以及残肢的非线性超弹性材料特性。软组织。此非线性静态分析是在两个时间步骤中进行的。第一步涉及解决过盈配合分析，以研究由于穿戴的影响而产生的预应力。穿戴过程导致软组织移位，以适应假体的内部几何形状。在第二次施加负荷的步骤中，将一半体重的额外负荷施加到了股骨上。由于穿戴程序和体重施加的共同作用，观察到最大法向应力（接触压力）为84 kPa，与其他研究人员进行的研究相当。通过这项工作开发的程序可供将来的研究人员和假肢设计者用来了解如何更好地设计经股假体。

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    Surapureddy, Rajesh;

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