Abstract：
The foot is a highly complex biomechanical system for which finite element (FE) modeling has been used to evaluate its loading environment. However, there is limited knowledge of first metatarsophalangeal (MTP) and first metatarsocuneiform (MTC) joint contact mechanics. Our goal was to develop a framework for FE modeling of the medial forefoot which could accurately predict experimental measurements of first MTP and first MTC joint loading. Simulations of planus and rectus foot types were conducted for midstance of gait. A custom-built force-controlled cadaveric test-rig was used to derive intracapsular pressure sensor measurements of contact pressure, force, and area during quasi-static loading. The FE model was driven under the same boundary and loading conditions as the cadaver. Mesh sensitivity analyses and best-fit calibrations of moduli for first MTP and first MTC joint cartilage were performed. Consistent with previous experimental research, a lower compressive modulus was best-fit to the first MTP compared to first MTC joint at 10 MPa and 20 MPa, respectively. Mean errors in contact pressures, forces, and areas were 24%, 4%, and 40% at the first MTP joint and 23%, 12%, and 19% at the first MTC joint, respectively. The present developmental framework may provide a basis for future modeling of first MTP and first MTC joint contact mechanics. This study acts as a precursor to validation of realistic physiological loading across gait to investigate joint loading, foot type biomechanics, and surgical interventions of the medial forefoot.
摘要：
脚是一个高度复杂的生物力学系统，已使用有限元（FE）建模来评估其加载环境。然而,对第一meta趾（MTP）和第一meta骨（MTC）关节接触力学的了解有限。我们的目标是开发一个用于前足内侧FE建模的框架，该框架可以准确地预测第一个MTP和第一个MTC关节负荷的实验测量值。针对步态中速进行了平面和直肌足部类型的模拟。使用定制的力控尸体试验台来得出囊内压力传感器的接触压力测量值，力,准静态加载期间的面积。在与尸体相同的边界和加载条件下驱动FE模型。对第一MTP和第一MTC关节软骨进行网格灵敏度分析和模量的最佳拟合校准。与以往的实验研究一致，在10MPa和20MPa下，与第一MTC接头相比，较低的压缩模量最适合第一MTP，分别。接触压力的平均误差，部队,面积为24%，4%,第一个MTP关节为40%，23%，12%,在第一个MTC关节中为19%，分别。本开发框架可以为第一MTP和第一MTC关节接触力学的未来建模提供基础。这项研究作为验证跨步态的现实生理负荷的前兆，以研究关节负荷，足部生物力学,和内侧前足的外科手术。
