伴有足中关节炎的扁平足患者矫正鞋垫的生物力学研究

doi:10.3969/j.issn.0258-8021.2020.03.10

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Abstract In order to study the effect of orthotic insoles with different structure and material stiffness on plantar stress concentration and internal articular cartilage and fascia stress of flatfoot patients with midfoot arthritis, based on the finite element analysis and orthogonal experimental design, the finite element model of patient's foot and orthotic insole was established by using CT image data. A footscan system was used to measure the stress of plantar regions during stance phase to verify the accuracy of the simulation results. The effect of orthotic insoles was analyzed and compared by finite element results. Results indicated that the orthotic insole with 30 mm arch height, 5 degree wedge angle and 1 MPa stiffness had the best effect. Compared with the stresses barefoot, the surface and internal stresses of heel and metatarsal areas decreased by 62.5% (from 0.152 MPa to 0.057 MPa) and 77.9% (from 0.245 MPa to 0.054 MPa), respectively. At the same time, the surface and internal stresses of the metatarsal area decreased by 56.0% (from 0.125 MPa to 0.055 MPa) and 72.9% (from 0.192 MPa to 0.052 MPa), respectively. Compared with ordinary contact insoles, the stress distribution of sole is more uniform, and the stress of scaphoid wedge articular cartilage and fascia is less. The results provided data basis for the design of orthotic insoles with compound action under this complex disease.

Key words： orthotic insole midfoot arthritis flatfoot orthogonal experimental design finite element

Received: 14 June 2019

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R318

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	Articles by authors
	Zhang Haowei
	Yang Junyan
	Liu Ying
	Chen Liang

Cite this article:

Zhang Haowei,Yang Junyan,Liu Ying, et al. Biomechanical Study of Orthotic Insoles for Flatfoot Patients with Midfoot Arthritis[J]. Chinese Journal of Biomedical Engineering, 2020, 39(3): 327-334.

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http://cjbme.csbme.org/EN/10.3969/j.issn.0258-8021.2020.03.10 OR http://cjbme.csbme.org/EN/Y2020/V39/I3/327

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