外侧楔形鞋垫对足踝生物力学影响的有限元分析

目的 探究外侧楔形鞋垫对足踝内部组织(包括足骨、关节和韧带)的生物力学影响。 方法 建立并验证足踝-鞋垫-地面三维有限元模型,探究步态 3 个关键瞬间赤足模型和鞋垫干预模型的足底压力分布、关节接触压力、跖骨及主要韧带的应力。 结果 5°外侧楔形鞋垫模型足底峰值压力比赤足模型减小 65. 8% 。 鞋垫干预使楔舟关节处峰值接触压力减小;距下关节处峰值接触压力和第 4、5 跖骨处峰值应力增大。 结论 本研究量化评估了外侧楔形鞋垫对足踝各部分的生物力学影响,提出了可适当减小外侧楔形鞋垫第 4、5 跖骨处倾斜角度的设计建议。

Biomechanical Effects of Lateral Wedge Insoles on Foot and Ankle:A Finite Element Analysis

Objective To investigate the biomechanical effects of lateral wedge insole (LWI) on internal tissues of the foot and ankle (including foot bones, joints, and ligaments). Methods A three-dimensional finite element model of the foot-insole-ground was developed and validated, and the plantar pressure distributions, contact pressures on joints, and peak stresses on metatarsals and major ligaments in barefoot model and insole intervention models at three key gait instants were explored. Results The 5° LWI model reduced the peak plantar pressure by 65. 8% compared to the barefoot model. Insole interventions decreased the peak contact pressure at the cuneonavicular joint, but increased the peak contact pressure at the subtalar joint and peak stress at the 4th and 5th metatarsals. Conclusions This study quantitatively assesses the biomechanical effects of LWI on various parts of the foot and ankle, and suggests a design that can appropriately reduce the inclination angle of LWI at the 4th and 5th metatarsals.