Gu Y D, Li J S, Lake M J, Zeng Y J, Ren X J, Li Z Y
Ningbo University, Zhejiang, P.R. China.
Comput Methods Biomech Biomed Engin. 2011 Aug;14(8):747-53. doi: 10.1080/10255842.2010.493886. Epub 2011 May 24.
The primary objective of this paper is to study the use of medical image-based finite element (FE) modelling in subject-specific midsole design and optimisation for heel pressure reduction using a midsole plug under the calcaneus area (UCA). Plugs with different relative dimensions to the size of the calcaneus of the subject have been incorporated in the heel region of the midsole. The FE foot model was validated by comparing the numerically predicted plantar pressure with biomechanical tests conducted on the same subject. For each UCA midsole plug design, the effect of material properties and plug thicknesses on the plantar pressure distribution and peak pressure level during the heel strike phase of normal walking was systematically studied. The results showed that the UCA midsole insert could effectively modify the pressure distribution, and its effect is directly associated with the ratio of the plug dimension to the size of the calcaneus bone of the subject. A medium hardness plug with a size of 95% of the calcaneus has achieved the best performance for relieving the peak pressure in comparison with the pressure level for a solid midsole without a plug, whereas a smaller plug with a size of 65% of the calcaneus insert with a very soft material showed minimum beneficial effect for the pressure relief.
本文的主要目的是研究基于医学图像的有限元（FE）建模在针对个体的中底设计和优化中的应用，以通过在跟骨区域（UCA）下方使用中底插片来降低足跟压力。在中底的后跟区域纳入了与受试者跟骨尺寸具有不同相对尺寸的插片。通过将数值预测的足底压力与在同一受试者上进行的生物力学测试进行比较，对有限元足部模型进行了验证。对于每个UCA中底插片设计，系统地研究了材料特性和插片厚度对正常行走足跟撞击阶段足底压力分布和峰值压力水平的影响。结果表明，UCA中底插片可以有效地改变压力分布，其效果与插片尺寸与受试者跟骨尺寸的比例直接相关。与没有插片的实心中底的压力水平相比，尺寸为跟骨95%的中等硬度插片在减轻峰值压力方面表现出最佳性能，而尺寸为跟骨65%的较小插片与非常柔软的材料一起使用时，对减轻压力的有益效果最小。
