The effect of insoles in therapeutic footwear - A finite element approach
The effect of insoles in therapeutic footwear - A finite element approach
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DOI：
10.1016/s0021-9290(97)00006-7
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发表时间：
1997-06-01
影响因子：
2.4
通讯作者：
Cavanagh, PR
中科院分区：
文献类型：
--
作者：
Lemmon, D;Shiang, TY;Cavanagh, PR
目前预防神经性足溃疡复发的做法是使用可调节的鞋内矫形器或鞋垫，以降低骨突出位置处的足底压力水平，特别是跖骨头下方。迄今为止，这些矫形器的设计很大程度上是一个反复试验的过程。关于厚度的影响和软组织特性的影响以及此类干预措施的缓冲效果，可用的定量信息很少。当前的论文研究了第二跖骨头下的压力变化作为鞋垫厚度和组织厚度的函数。采用实验和准静态平面应变有限元方法。所选择的矫形器最多可将足底压力降低约 30%，并且在减少跖骨下组织厚度的情况下更有效（按百分比计算）。有限元模型预测的峰值法向应力平均在正常组织情况下的实验测量值的 5.9% 范围内，在还原组织情况下的实验测量值的 8.1% 范围内。所提出的技术代表了一种了解足底缓冲的有前途的方法以及设计针对无知觉足部的治疗鞋的原理。 (C) 1997 年由爱思唯尔科学有限公司出版。
Current practice in the prevention of recurrence of neuropathic foot ulcers is to prescribe accommodative in-shoe orthoses or insoles which reduce plantar pressure levels at locations of bony prominences, particularly under the metatarsal heads. To date, design of these orthoses has largely been a trial and error process. There is little quantitative information available regarding the effects of thickness and the influence of soft tissue characteristics an the cushioning effect of such interventions. The current paper investigated alterations in pressure under the second metatarsal head as a function of insole thickness and tissue thickness. Both experimental and quasi-static plane strain finite element approaches were employed. The orthoses chosen reduced plantar pressure by a maximum of approximately 30% and were more effective (on a percentage basis) in the setting of reduced sub-metatarsal tissue thickness. Peak normal stresses predicted by the FE models were, on average, within 5.9% of experimentally measured values for the normal tissue case and 8.1% for the reduced tissue case. The techniques presented represent a promising approach to understanding plantar cushioning and the principles involved in the design of therapeutic footwear for insensate feet. (C) 1997 Published by Elsevier Science Ltd.