Estimation of quasi-stiffness of the human hip in the stance phase of walking

PloS One
Kamran ShamaeiAaron M Dollar

Abstract

This work presents a framework for selection of subject-specific quasi-stiffness of hip orthoses and exoskeletons, and other devices that are intended to emulate the biological performance of this joint during walking. The hip joint exhibits linear moment-angular excursion behavior in both the extension and flexion stages of the resilient loading-unloading phase that consists of terminal stance and initial swing phases. Here, we establish statistical models that can closely estimate the slope of linear fits to the moment-angle graph of the hip in this phase, termed as the quasi-stiffness of the hip. Employing an inverse dynamics analysis, we identify a series of parameters that can capture the nearly linear hip quasi-stiffnesses in the resilient loading phase. We then employ regression analysis on experimental moment-angle data of 216 gait trials across 26 human adults walking over a wide range of gait speeds (0.75-2.63 m/s) to obtain a set of general-form statistical models that estimate the hip quasi-stiffnesses using body weight and height, gait speed, and hip excursion. We show that the general-form models can closely estimate the hip quasi-stiffness in the extension (R(2) = 92%) and flexion portions (R(2) = 89%) of the res...Continue Reading

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Citations

Feb 20, 2016·Journal of the American Podiatric Medical Association·Enrique Sanchis-SalesJavier Pascual-Huerta
May 9, 2015·IEEE Transactions on Bio-medical Engineering·Kamran ShamaeiAaron M Dollar
Sep 27, 2015·Annals of Biomedical Engineering·He HuangDing Wang
Apr 14, 2017·Royal Society Open Science·Dominic James Farris, Brent J Raiteri
Jun 4, 2019·Frontiers in Neurorobotics·David Rodriguez-CiancaDirk Lefeber
Aug 23, 2016·Bioinspiration & Biomimetics·Diego TorricelliJose L Pons
Oct 3, 2020·Journal of Biomechanical Engineering·Kathryn M OlesnavageAmos G Winter
Jun 8, 2021·Journal of Neuroengineering and Rehabilitation·Tiancheng ZhouXiaolin Huang

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