201206272241Reduction of plantar heel pressures: Insole design using finite element analysis

Reduction of plantar heel pressures: Insole design using finite element analysis.

Goske S, Erdemir A, Petre M, Budhabhatti S, Cavanagh PR.

Abstract

Plantar heel pain is a common condition that is often exacerbated by the repetitive stresses of walking. Treatment usually includes an in-shoe intervention designed to reduce plantar pressure under the heel by using insoles and a variety of off-the-shelf products...... In this study, we used two-dimensional plane strain finite element modeling to investigate 27 insole designs. Combinations of three insole conformity levels (flat, half conforming, full conforming)...and three insole materials (Poron Cushioning, Microcel Puff Lite and Microcel Puff) were simulated during the early support phase of gait.........The model predicted a 24% relief in pressure compared to barefoot conditions when using flat insoles; the reduction increased up to 44% for full conforming insoles.

 

   足跟痛是一種常見的情況,且會因為走路時重覆的應力作用,而常常會造成惡化,一般在治療方面通常是藉由在鞋子內部添加鞋墊,或是購買各種現成的鞋墊等產品以達到減低足跟下的足底壓力,不過目前對於這些產品的設計/製作過程,似乎是依賴天生的直覺多過於科學的數據,於是我們想藉由有限元素分析進行實驗。有限元素分析提供一種有效的計算機之架構,其可以執行大量的研究之設計,以期達到降低足底壓力的最佳化數值。

    在此研究中我們使用2維平面的應變有限元素模型,用以探討27種鞋墊之設計。我們將鞋墊分成3種不同的設計高度/方式(flat,half-and-full-conforming,)3種鞋墊的厚度數值為(6.39.512.7mm)、與3種鞋墊的材質(Poron Cushioning Microcel Puff Lite Microcel Puff)等做結合,用以模擬鞋墊在步態初始支撐期的使用情形。藉由實驗法,執行對於相同實驗對象的足跟進行裸足之模擬,其方法是踩在硬表面與發泡類的泡棉墊上,經由實驗法的測試後,其模型的足底壓力之預測是可行的。鞋墊的Conformity是最重要的設計變數,而在本研究中發現峰值壓力與鞋墊材質的選擇上相關甚少。當使用平坦鞋墊與裸足情形相比之下,此模型預測將可減輕24%的壓力;而使用full conforming設計方式的鞋墊與裸足情形相比之下,將可減輕44%的足底壓力。

 

出處:http://www.ncbi.nlm.nih.gov/pubmed/16197952

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