韧带和跖腱膜在足部有限元分析中的力学作用

Effects of Ligaments and Plantar Fascia on the Foot Finite Element Analysis

目前通过建立足部三维有限元系统模型进行足部生物力学仿真已经逐渐被应用,而在大多数足部三维有限元模型的静态分析中,韧带和跖腱膜等软组织是通过直接连接骨骼上相应的附着点形成的索单元来模拟,而关节软骨把相邻的骨骼直接固连在一起。这种用关节软骨固连的方式代替真实的骨骼间的滑动摩擦,增强了骨骼间的结构强度,可能会造成原本由韧带等起到维持骨骼间相互作用却完全由关节软骨代替,即在有限元模型中,可能韧带等组织对仿真不起力学作用。本文的研究目的是在双足站立、静态载荷,关节采用固连方式时,分析足部三维有限元模型中有无韧带和跖腱膜对足部各种组织应力分布以及组织结构形态变化等的影响。

Some 3D finite element systemic models are currently established and used to simulate the foot biomechanical state. However1 during most of these 3D foot finite element static analyses, ligaments and plantar fascia are generally defined by connecting the corresponding attachment points on the bones, and the spaces between the bones are fused together by solid elements with given cartilage stiffness to simulate the connection of bones, This ＂connection of bones＂ takes the place of the real interactions between neighbored bones and enhances the structure of foot, which possibly leads to the result that the effects of ligaments and other soft tissues are completely replaced by the effect of articular cartilages, Thereby, ligaments and other soft tissues maybe not play an inherent role in the finite element analysis, The objective of this study was to estimate whether there exists the effect of ligaments and plantar fascia on the biomechanical behaviors of the foot tissue stress distribution and foot structure deformation during the balanced standing stance and static finite element analysis.