Department of Biomechanical Engineering, University of Twente, Enschede, 7500 AE, The Netherlands.
Biomed Phys Eng Express. 2024 Apr 5;10(3). doi: 10.1088/2057-1976/ad233d.
In this study, a combined subject-specific numerical and experimental investigation was conducted to explore the plantar pressure of an individual. The research utilized finite element (FE) and musculoskeletal modelling based on computed tomography (CT) images of an ankle-foot complex and three-dimensional gait measurements. Muscle forces were estimated using an individualized multi-body musculoskeletal model in five gait phases. The results of the FE model and gait measurements for the same subject revealed the highest stress concentration of 0.48 MPa in the forefoot, which aligns with previously-reported clinical observations. Additionally, the study found that the encapsulated soft tissue FE model with hyper-elastic properties exhibited higher stresses compared to the model with linear-elastic properties, with maximum ratios of 1.16 and 1.88 MPa in the contact pressure and von-Mises stress, respectively. Furthermore, the numerical simulation demonstrated that the use of an individualized insole caused a reduction of 8.3% in the maximum contact plantar pressure and 14.7% in the maximum von-Mises stress in the encapsulated soft tissue. Overall, the developed model in this investigation holds potential for facilitating further studies on foot pathologies and the improvement of rehabilitation techniques in clinical settings.
本研究采用基于 CT 图像的个体化有限元（FE）和骨骼肌肉建模以及三维步态测量，对个体足底压力进行了联合的专题特异性数值和实验研究。在五个步态阶段中，使用个体化多体骨骼肌肉模型来估计肌肉力。FE 模型和同一受试者的步态测量结果显示，前足的最大应力集中为 0.48MPa，与先前报道的临床观察结果一致。此外，该研究发现，具有超弹性特性的封装软组织 FE 模型的应力比具有线弹性特性的模型更高，在接触压力和 von-Mises 应力方面，最大比值分别为 1.16 和 1.88MPa。此外，数值模拟表明，使用个体化鞋垫可使最大接触足底压力降低 8.3%，使封装软组织中的最大 von-Mises 应力降低 14.7%。总的来说，本研究中开发的模型具有促进足部病理学研究和改善临床康复技术的潜力。
