Morales-Orcajo Enrique, Souza Thales R, Bayod Javier, Barbosa de Las Casas Estevam
Group of Structural Mechanics and Materials Modeling (GEMM), Aragón Institute of Engineering Research (I3A). University of Zaragoza, Zaragoza, Spain; Biomedical Research Networking Center in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Spain; Group of Biomechanical Engineering UFMG - (MecBio), School of Engineering, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil; Mechanical Engineering Department, School of Engineering and Architecture (EINA), University of Zaragoza, c/María de Luna s/n, Betancourt Building, 50018 Zaragoza, Spain.
Department of Physical Therapy, Graduate Program in Rehabilitation Sciences, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil.
Med Eng Phys. 2017 Nov;49:71-78. doi: 10.1016/j.medengphy.2017.07.010. Epub 2017 Aug 12.
A three-dimensional foot finite element model with actual geometry and non-linear behavior of tendons is presented. The model is intended for analysis of the lower limb tendon forces effect in the inner foot structure. The geometry of the model was obtained from computational tomographies and magnetic resonance images. Tendon tissue was characterized with the first order Ogden material model based on experimental data from human foot tendons. Kinetic data was employed to set the load conditions. After model validation, a force sensitivity study of the five major foot extrinsic tendons was conducted to evaluate the function of each tendon. A synergic work of the inversion-eversion tendons was predicted. Pulling from a peroneus or tibialis tendon stressed the antagonist tendons while reducing the stress in the agonist. Similar paired action was predicted for the Achilles tendon with the tibialis anterior. This behavior explains the complex control motion performed by the foot. Furthermore, the stress state at the plantar fascia, the talocrural joint cartilage, the plantar soft tissue and the tendons were estimated in the early and late midstance phase of walking. These estimations will help in the understanding of the functional role of the extrinsic muscle-tendon-units in foot pronation-supination.
本文提出了一种具有实际几何形状和肌腱非线性行为的三维足部有限元模型。该模型旨在分析下肢肌腱力对内足结构的影响。模型的几何形状来自计算机断层扫描和磁共振图像。基于人体足部肌腱的实验数据，采用一阶奥格登材料模型对肌腱组织进行了表征。利用动力学数据设定载荷条件。在模型验证之后，对五条主要的足部外在肌腱进行了力敏感性研究，以评估每条肌腱的功能。预测了内翻-外翻肌腱的协同作用。腓骨肌腱或胫骨肌腱的牵拉会使拮抗肌腱受力，同时降低主动肌肌腱的应力。跟腱与胫骨前肌也有类似的配对作用。这种行为解释了足部执行的复杂控制运动。此外，还估计了步行中早期和晚期支撑相足底筋膜、距小腿关节软骨、足底软组织和肌腱的应力状态。这些估计将有助于理解外在肌肉-肌腱单元在足内旋-外旋中的功能作用。
