Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing 100086, China.
Beijing Key Laboratory of Rehabilitation Technical Aids for Old-Age Disability, Key Laboratory of Rehabilitation Technical Aids Analysis and Identification of the Ministry of Civil Affairs, National Research Centre for Rehabilitation Technical Aids, Beijing 100176, China.
J Healthc Eng. 2017;2017:8614341. doi: 10.1155/2017/8614341. Epub 2017 Jun 12.
Flat foot is one of the common deformities in the youth population, seriously affecting the weight supporting and daily exercising. However, there is lacking of quantitative data relative to material selection and shape design of the personalized orthopedic insole. This study was to evaluate the biomechanical effects of material hardness and support height of personalized orthopedic insole on foot tissues, by in vivo experiment and finite element modeling. The correction of arch height increased with material hardness and support height. The peak plantar pressure increased with the material hardness, and these values by wearing insoles of 40° were apparently higher than the bare feet condition. Harder insole material results in higher stress in the joint and ligament stress than softer material. In the calcaneocuboid joint, the stress increased with the arch height of insoles. The material hardness did not apparently affect the stress in the ankle joints, but the support heights of insole did. In general, insole material and support design are positively affecting the correction of orthopedic insole, but negatively resulting in unreasonable stress on the stress in the joint and ligaments. There should be an integration of improving correction and reducing stress in foot tissues.
平足是青少年人群中常见的畸形之一，严重影响着承重和日常运动。然而，在个性化矫形鞋垫的材料选择和形状设计方面，缺乏定量数据。本研究通过体内实验和有限元建模，评估了个性化矫形鞋垫材料硬度和支撑高度对足部组织的生物力学影响。足弓高度的矫正随着材料硬度和支撑高度的增加而增加。足底峰值压力随着材料硬度的增加而增加，而佩戴 40°矫形鞋垫的这些值明显高于赤脚状态。较硬的鞋垫材料会导致关节和韧带的应力比较软的材料更高。在跟骰关节，随着鞋垫足弓高度的增加，关节处的压力也会增加。鞋垫材料硬度对踝关节处的压力没有明显影响，但鞋垫的支撑高度有影响。总的来说，鞋垫材料和支撑设计对矫形鞋垫的矫正有积极影响，但对关节和韧带的压力会产生不合理的影响。应该将改善矫正和减轻足部组织的压力结合起来。
