Patil K M, Braak L H, Huson A
Department of Applied Mechanics, Indian Institute of Technology, Madras.
Med Biol Eng Comput. 1996 Jul;34(4):280-4. doi: 10.1007/BF02511238.
A two-dimensional model of the normal foot skeleton, which includes cartilages and ligaments, is used in this analysis of stresses during three quasi-static walking phases: heel-strike, mid-stance and push-off. It is found that in all the walking phases the maximum values of principal stresses occur in the dorsal anterior region of the talus, whereas the highest stress occurs in the push-off phase. The model is used for the simulation of muscle paralysis and its effect on the distribution of principal stresses. Subsequently, the model is used to analyse stresses in the deformed feet of three leprosy patients with complete paralysis of certain muscles. The results demonstrate that both the shape of the foot and the type of muscle paralysis contribute to the development of high stresses in different regions of the foot. These high stresses in regions with reduced mechanical strength could be one of the important factors in the process of tarsal disintegration in leprosy.
本分析在足跟触地、站立中期和蹬离三个准静态步行阶段的应力时，使用了包含软骨和韧带的正常足部骨骼二维模型。结果发现，在所有步行阶段，主应力的最大值出现在距骨的背侧前部区域，而最高应力出现在蹬离阶段。该模型用于模拟肌肉麻痹及其对主应力分布的影响。随后，该模型用于分析三名某些肌肉完全麻痹的麻风病患者变形足部的应力。结果表明，足部形状和肌肉麻痹类型均会导致足部不同区域出现高应力。机械强度降低区域的这些高应力可能是麻风病跗骨崩解过程中的重要因素之一。
