Estimation of Quasi-Stiffness of the Human Hip in the Stance Phase of Walking

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 exten...

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Main Authors:	Shamaei, Kamran, Sawicki, Gregory S., Dollar, Aaron M.
Format:	Online
Language:	English
Published:	Public Library of Science 2013
Online Access:	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3857237/

id	pubmed-3857237
recordtype	oai_dc
spelling	pubmed-38572372013-12-13 Estimation of Quasi-Stiffness of the Human Hip in the Stance Phase of Walking Shamaei, Kamran Sawicki, Gregory S. Dollar, Aaron M. Research Article 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 (R2 = 92%) and flexion portions (R2 = 89%) of the resilient loading phase of the gait. We further simplify the general-form models and present a set of stature-based models that can estimate the hip quasi-stiffness for the preferred gait speed using only body weight and height with an average error of 27% for the extension stage and 37% for the flexion stage. Public Library of Science 2013-12-09 /pmc/articles/PMC3857237/ /pubmed/24349136 http://dx.doi.org/10.1371/journal.pone.0081841 Text en © 2013 Shamaei et al http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.
repository_type	Open Access Journal
institution_category	Foreign Institution
institution	US National Center for Biotechnology Information
building	NCBI PubMed
collection	Online Access
language	English
format	Online
author	Shamaei, Kamran Sawicki, Gregory S. Dollar, Aaron M.
spellingShingle	Shamaei, Kamran Sawicki, Gregory S. Dollar, Aaron M. Estimation of Quasi-Stiffness of the Human Hip in the Stance Phase of Walking
author_facet	Shamaei, Kamran Sawicki, Gregory S. Dollar, Aaron M.
author_sort	Shamaei, Kamran
title	Estimation of Quasi-Stiffness of the Human Hip in the Stance Phase of Walking
title_short	Estimation of Quasi-Stiffness of the Human Hip in the Stance Phase of Walking
title_full	Estimation of Quasi-Stiffness of the Human Hip in the Stance Phase of Walking
title_fullStr	Estimation of Quasi-Stiffness of the Human Hip in the Stance Phase of Walking
title_full_unstemmed	Estimation of Quasi-Stiffness of the Human Hip in the Stance Phase of Walking
title_sort	estimation of quasi-stiffness of the human hip in the stance phase of walking
description	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 (R2 = 92%) and flexion portions (R2 = 89%) of the resilient loading phase of the gait. We further simplify the general-form models and present a set of stature-based models that can estimate the hip quasi-stiffness for the preferred gait speed using only body weight and height with an average error of 27% for the extension stage and 37% for the flexion stage.
publisher	Public Library of Science
publishDate	2013
url	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3857237/
_version_	1612036730669498368

Estimation of Quasi-Stiffness of the Human Hip in the Stance Phase of Walking

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