Effects of deep knee flexion on skin pressure profile with lower limb device: A computational study

Knee flexion behavior alters the contact pressure distribution exerted by compression devices during exercise. This study aimed to develop a three-dimensional dynamic finite element model of the lower limb with detailed bony structures, wearing a compression device with higher pressure over the calf...

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Bibliographic Details
Published in:Textile research journal 2020-09, Vol.90 (17-18), p.1962-1973
Main Authors: Lin, Yinglei, Li, Yi, Yao, Lei, Zhao, Guoru, Wang, Lei
Format: Article
Language:English
Subjects:
Ankle
Compression
Computer applications
Contact pressure
Cross-sections
Depth profiling
Deviation
Finite element method
Garments
Knee
Mathematical models
Muscles
Pressure
Pressure distribution
Pressure gradients
Stress concentration
Thigh
Three dimensional models
Walking
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Summary:Knee flexion behavior alters the contact pressure distribution exerted by compression devices during exercise. This study aimed to develop a three-dimensional dynamic finite element model of the lower limb with detailed bony structures, wearing a compression device with higher pressure over the calf, and then to quantify and compare the garment–body interface contact pressure and the cross-section pressure gradient deviation in standing and deep knee flexion postures (30°, 60°, 90°, and 120° of knee flexion). Contact pressure experiment on seven muscle points was applied to validate the model. The cross-section pressure gradient deviation was calculated on landmarks based on deviation along the four axial pathways from the average cross-section pressure gradients. In general, the results demonstrated that the whole pressure profile gradually decreased from the ankle to the thigh with higher compression on the calf in a standing position. Cross-section pressure gradient deviation resulted in a dramatic increase of ∼100% and ∼110% on positions B1 and D on the anterior of calf at 60° flexion, respectively, which resembled an M shape. This phenomenon was caused by the combination of the stretch of clothing during knee flexion, high compression over the calf, and the shape of the lower limb. This finite element model and its findings together could help us to understand the compression effects of sports lower limb devices and garments to enhance walking and running performance, and help to improve the design concepts.
ISSN:0040-5175
1746-7748
DOI:10.1177/0040517520902275