部分足部截肢病人足部與輔具材料之生物力學評估

Biomechanical Evaluation of the Foot and Prothesis Materials for Patients with Partial Foot Amputation

王建章(Jian-Zhang Wang)

指導教授 ： 鄧復旦 ； 陳文斌

中原大學/工學院/醫學工程研究所/碩士(2003年)

https://doi.org/10.6840/cycu200300706

摘要

摘要
因糖尿病或其他因素導致足部截肢的患者日趨增加，使用足部輔具對於足部截肢病患而言，不僅對基本的行走功能有助益，更可以減輕截肢後使用不當的鞋具所造成的負面影響。本研究針對截肢病人在穿著足部輔具前後作實驗及有限元素分析，並對現有的輔具材料做分析流程的建立。研究中將輔具材料的靜態應力應變值代入有限元素分析軟體做非線性材料模擬，並將材料參數代入足部及輔具模型模擬靜態站立分析，得到足底正向應力分佈結果。臨床量測上，實際量測正常足和截肢足患者穿輔具與裸足的足底壓力分佈狀況，比較足底六個分區域的正向最大應力值，了解輔具降低足底應力分佈和壓力峰值的效益。之後並對足底壓力分布狀況做實驗與有限元素分析上的比較探討。實驗結果顯示，無論正常足或是蹠骨截肢患者，穿著輔具站立與裸足站立相比，除中足的足底最高應力增加外，其它區域都有降低60%以上的表現，顯示輔具有效將足部的壓力分散及降低。有限元素分析裸足站立結果顯示足底壓力分佈與量測結果極為相近，正常足的分析值與實驗值接近，唯截肢足分析值較實驗值高，但亦有效反映數值分析的可信度。

關鍵字

輔具、足底壓力量測 ； 非線性材料模擬 ； 足部截肢 ； 有限元素分析

並列摘要

ABSTRACT
Material testing, plantar pressure measurement and finite element analysis were performed for the prostheses for partial foot amputation patients in this study. Based on the results of finite element simulation and experimental measurements, a simple and quantitative evaluation process was established. The validity of the finite element analysis was also investigated. In the prosthesis material simulation, the compressive stress-strain curves were input to the finite element analysis software (MSC/Marc) for nonlinear material simulation. The material properties were then used in the foot-prosthesis model for finite element analysis. The peak plantar pressure differences between the barefoot and the foot with prosthesis conditions in standing position were compared for the six plantar regions. Results showed that prostheses could reduce plantar pressure effectively for all plantar regions except the midfoot region. This concluded that the prostheses could transfer the pressure from the heel to the midfoot region. As for the finite element analysis in barefoot standing condition, the plantar pressure distributions were similar with the experimental results. For the foot with prosthesis model, the stress distributions were similar, however, the analysis results were higher than the experimental results. The validity of the finite element analysis was verified in this study.

並列關鍵字

foot prosthesis/orthosis ； plantar pressure measurement ； partial foot amputation ； nonlinear material simulation ； finite element analysis

參考文獻

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