加入碳纖維板對功能性足部輔具之生物力學評估

Biomechanical Evaluation of Combining Carbon Foot Plate with Functional Foot Orthoses

蔡勝平(Sheng-Ping Cai)

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/cycu200300704

摘要

本研究針對部份足部截肢之病患，利用鞋內墊量測系統及有限元素分析，探討當改變不同輔具材料組合並在鞋底添加碳纖維板材時對病患足部生物力學上的改變。並且利用材料試驗機量測出輔具材料的材料性質，將不同的輔具材質搭配帶入有限元素模型中，利用有限元素分析完整的討論當改變輔具材料軟硬性質組合時，對足部力與壓力變化情況。首先經由量測結果得知當加入碳纖維板材於鞋底下，可以使病患在推進過程中時間縮短、推進力增加，證明使用此板材於鞋底中有增加推進的效果。在有限元素分析方面，首先模擬步態週期中之推進期，並將電腦模擬結果與臨床量測結果相驗證，確立模擬方式。接著改變輔具之材料組合，模擬推進期時足底壓力之分布情形，由模擬數值可以發現當鞋底材料使用較硬材質時，相對應力值也隨之升高。另外分析中也探討截肢足部前端應力變化大小，當選用填塊為較硬材質時，應力值也相對升高，故為了降低足部在推進過程中應力值，可以使用軟質材料製作鞋墊，而使用較軟的半硬質材料製成鞋底與填塊部分，即可有效降低足部應力值，使足部在推進過程中避免受到過大應力而產生病變。

關鍵字

部份足部截肢 ； 足部輔具 ； 足底壓力 ； 足部生物力學 ； 有限元素分析法

並列摘要

This research utilized plantar pressure measurement and finite element analysis to the biomechanical effects of orthoses with carbon foot plate for patients with partial foot amputation.The material properties of several commonly used orthosis materials were measured using a material testing machine and then input into a finite element software for nonlinear material simulation. From the pressure measurement results we found: When carbon foot plate was added into the orthosis, the propulsive time was shortened and the propulsive force was increased. This result indicated that the carbon foot plate has the benefit of enhancing the push-off capability for patients with partial foot amputation. The effects of different orthosis material combinations on the plantar pressure distributions of a patient with partial foot amputation were then investigated using finite element analysis. Based on the finite element analysis results, we found that: When harder material was used for the bottom layer of the orthosis the plantar pressure was increased. When harder material was used for the filler of the orthosis, the stress at the anterior portion of the amputation foot was increased. Therefore, in order to reduce the stresses in the foot during push-off phase, material combination of softer upper layer (and filler), and harder bottom layer may be a better choice for the orthosis and can avoid the possible harmful high stress in the foot for patients with partial foot amputation.

並列關鍵字

foot orthosis ； partial foot amputation ； plantar pressure ； foot biomechanics ； finite element analysis

參考文獻

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