■足底拱顶,包括人脚的横向和纵向拱门,对冲击吸收至关重要,弹性储能,和推进。最近的研究强调了横向弓的重要性,对中脚刚度贡献超过40%。这项研究旨在通过改变深meta横韧带(DTML)的刚度来量化踝足复合体的生物力学反应。
■使用CT图像重建,构建了复杂的足踝关节三维有限元模型,考虑几何复杂性和非线性特征。我们研究的重点是评估不同的前足横弓刚度的影响,也就是说,DTML的不同杨氏模量值(从135MPa到405MPa),关于足部和踝关节复合体的不同生物力学方面。值得注意的是,我们分析了它们对足底压力分布的影响,跖骨应力模式,舟骨沉降,足底筋膜劳损.
■增加DTML的刚度对足部生物力学有重大影响。具体来说,较高的DTML刚度会导致第1阶段的冯·米塞斯应力升高,2nd,和第三跖骨,同时,当杨氏模量加倍时,足底压力降低了14.2%。这种僵硬也会阻碍舟骨下沉和脚的延长。值得注意的是,DTML的杨氏模量增加100%导致舟骨沉降减少54.1%,足部延长减少2.5%,它们共同有助于足部纵向刚度提高33.1%。此外,将DTML的杨氏模量加倍可使足底筋膜的应变拉伸减少38.5%。
■保持DTML完整性可维持横弓,增强脚的纵向刚度和弹性响应。这些发现对治疗足弓功能障碍具有重要意义,并为寻求增强推进力的鞋类开发人员提供了见解。
UNASSIGNED: The plantar vault, comprising the transverse and longitudinal arches of the human foot, is essential for impact absorption, elastic energy storage, and propulsion. Recent research underscores the importance of the transverse arch, contributing over 40% to midfoot stiffness. This study aimed to quantify biomechanical responses in the ankle-foot complex by varying the stiffness of the deep metatarsal transverse ligament (DTML).
UNASSIGNED: Using CT image reconstruction, we constructed a complex three-dimensional finite element model of the foot and ankle joint complex, accounting for geometric complexity and nonlinear characteristics. The focus of our study was to evaluate the effect of different forefoot transverse arch stiffness, that is, different Young\'s modulus values of DTML (from 135 MPa to 405 MPa), on different biomechanical aspects of the foot and ankle complex. Notably, we analyzed their effects on plantar pressure distribution, metatarsal stress patterns, navicular subsidence, and plantar fascial strain.
UNASSIGNED: Increasing the stiffness of the DTML has significant effects on foot biomechanics. Specifically, higher DTML stiffness leads to elevate von Mises stress in the 1st, 2nd, and 3rd metatarsals, while concurrently reducing plantar pressure by 14.2% when the Young\'s modulus is doubled. This stiffening also impedes navicular bone subsidence and foot lengthening. Notably, a 100% increase in the Young\'s modulus of DTML results in a 54.1% decrease in scaphoid subsidence and a 2.5% decrease in foot lengthening, which collectively contribute to a 33.1% enhancement in foot longitudinal stiffness. Additionally, doubling the Young\'s modulus of DTML can reduce the strain stretch of the plantar fascia by 38.5%.
UNASSIGNED: Preserving DTML integrity sustains the transverse arch, enhancing foot longitudinal stiffness and elastic responsiveness. These findings have implications for treating arch dysfunction and provide insights for shoe developers seeking to enhance propulsion.