Faculty of Sports Science, Ningbo University, China; Research Academy of Grand Health Interdisciplinary, Ningbo University, China; Faculty of Engineering and Technology, Liverpool John Moores University, UK.
Faculty of Sports Science, Ningbo University, China; Research Academy of Grand Health Interdisciplinary, Ningbo University, China; Department of Automation, Biomechanics and Mechatronics, The Lodz University of Technology, Poland.
Comput Biol Med. 2017 Dec 1;91:38-46. doi: 10.1016/j.compbiomed.2017.09.018. Epub 2017 Sep 25.
Due to the limitations of experimental approaches, comparison of the internal deformation and stresses of the human man foot between forefoot and rearfoot landing is not fully established. The objective of this work is to develop an effective FE modelling approach to comparatively study the stresses and energy in the foot during forefoot strike (FS) and rearfoot strike (RS). The stress level and rate of stress increase in the Metatarsals are established and the injury risk between these two landing styles is evaluated and discussed. A detailed subject specific FE foot model is developed and validated. A hexahedral dominated meshing scheme was applied on the surface of the foot bones and skin. An explicit solver (Abaqus/Explicit) was used to stimulate the transient landing process. The deformation and internal energy of the foot and stresses in the metatarsals are comparatively investigated. The results for forefoot strike tests showed an overall higher average stress level in the metatarsals during the entire landing cycle than that for rearfoot strike. The increase rate of the metatarsal stress from the 0.5 body weight (BW) to 2 BW load point is 30.76% for forefoot strike and 21.39% for rearfoot strike. The maximum rate of stress increase among the five metatarsals is observed on the 1st metatarsal in both landing modes. The results indicate that high stress level during forefoot landing phase may increase potential of metatarsal injuries.
由于实验方法的限制，对于前足和后足着地时人体足内部变形和应力的比较尚未完全确定。本工作的目的是开发一种有效的有限元建模方法，以比较研究前足着地（FS）和后足着地（RS）时足部的应力和能量。确定跖骨的应力水平和应力增加率，并评估和讨论这两种着地方式之间的受伤风险。开发并验证了一个详细的特定于主题的足部有限元模型。在足部骨骼和皮肤的表面应用了六面体主导的网格方案。显式求解器（Abaqus/Explicit）用于模拟瞬态着陆过程。比较研究了足部的变形和内部能量以及跖骨的应力。前足着地试验的结果表明，在整个着陆周期中，跖骨的平均应力水平总体上高于后足着地。从 0.5 体重（BW）到 2 BW 加载点，跖骨应力的增加率在前足着地时为 30.76%，在后足着地时为 21.39%。在两种着陆模式中，五个跖骨中最大的应力增加率出现在第一跖骨上。结果表明，前足着地阶段的高应力水平可能会增加跖骨受伤的风险。
