Chillale Tejas P, Kim Nam Ho, Smith Larry N
Department of Mechanical & Aerospace Engineering, 231 MAE-A, P.O. Box 116250, University of Florida, Gainesville, FL.
M:14;22-33, LLC, 10925 SW 27th Ave Gainesville, FL.
Mil Med. 2019 Mar 1;184(Suppl 1):627-636. doi: 10.1093/milmed/usy382.
This study was designed to test the hypothesis that: "A properly designed implant that harnesses the principle of the incompressibility of fluids can improve the weight carrying ability of an amputee's residual femur and reduce the frictional forces at the stump external socket interface." The hypothesis was tested both mechanically on an Amputee Simulation Device (ASD) and through Finite Element Analysis (FEA) modeling software. With the implant attached to the femur, the FEA and ASD demonstrated that the femur carried 90% and 93% respectively of the force of walking. Without the implant, the FEA model and ASD femur carried only 35% and 77%, respectively, of the force of walking. Statistical calculations reveal three (3) degrees of separation (99% probability of non-random significant difference) between with and without implant data points. FEA modeling demonstrates that the normal contact forces and shear forces are pushed the distal weight-bearing area of the amputee stump, relieving the lateral stump of frictional forces. The ASD mechanical and FEA modeling data validate each other with both systems supporting the hypotheses with confidence intervals of three degrees of separation between with implant and without implant models.
“一个经过合理设计、利用流体不可压缩原理的植入物，能够提高截肢者残余股骨的承重能力，并减少残肢与外部接受腔界面处的摩擦力。”该假设通过在截肢者模拟装置（ASD）上进行机械测试以及使用有限元分析（FEA）建模软件进行验证。当植入物附着在股骨上时，有限元分析和截肢者模拟装置表明，股骨分别承受了行走力的90%和93%。在没有植入物的情况下，有限元分析模型和截肢者模拟装置的股骨分别仅承受了行走力的35%和77%。统计计算显示，有植入物和无植入物数据点之间存在三（3）个分离度（非随机显著差异的概率为99%）。有限元分析建模表明，法向接触力和剪切力被推至截肢者残肢的远端承重区域，从而减轻了残肢外侧的摩擦力。截肢者模拟装置的机械测试和有限元分析建模数据相互验证，两个系统均以有植入物和无植入物模型之间三分离度的置信区间支持该假设。
