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Biphasic investigation of contact mechanics in natural human hips during activities

The aim of this study was to determine the cartilage contact mechanics and the associated fluid pressurisation of the hip joint under eight daily activities, using a three-dimensional finite element hip model with biphasic cartilage layers and generic geometries. Loads with spatial and temporal vari...

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Detalles Bibliográficos
Autores principales: Li, Junyan, Hua, Xijin, Jin, Zhongmin, Fisher, John, Wilcox, Ruth K
Formato: Online Artículo Texto
Lenguaje:English
Publicado: SAGE Publications 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4361357/
https://www.ncbi.nlm.nih.gov/pubmed/24898443
http://dx.doi.org/10.1177/0954411914537617
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author Li, Junyan
Hua, Xijin
Jin, Zhongmin
Fisher, John
Wilcox, Ruth K
author_facet Li, Junyan
Hua, Xijin
Jin, Zhongmin
Fisher, John
Wilcox, Ruth K
author_sort Li, Junyan
collection PubMed
description The aim of this study was to determine the cartilage contact mechanics and the associated fluid pressurisation of the hip joint under eight daily activities, using a three-dimensional finite element hip model with biphasic cartilage layers and generic geometries. Loads with spatial and temporal variations were applied over time and the time-dependent performance of the hip cartilage during walking was also evaluated. It was found that the fluid support ratio was over 90% during the majority of the cycles for all the eight activities. A reduced fluid support ratio was observed for the time at which the contact region slid towards the interior edge of the acetabular cartilage, but these occurred when the absolute level of the peak contact stress was minimal. Over 10 cycles of gait, the peak contact stress and peak fluid pressure remained constant, but a faster process of fluid exudation was observed for the interior edge region of the acetabular cartilage. The results demonstrate the excellent function of the hip cartilage within which the solid matrix is prevented from high levels of stress during activities owing to the load shared by fluid pressurisation. The findings are important in gaining a better understanding of the hip function during daily activities, as well as the pathology of hip degeneration and potential for future interventions. They provide a basis for future subject-specific biphasic investigations of hip performance during activities.
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spelling pubmed-43613572015-04-10 Biphasic investigation of contact mechanics in natural human hips during activities Li, Junyan Hua, Xijin Jin, Zhongmin Fisher, John Wilcox, Ruth K Proc Inst Mech Eng H Original Articles The aim of this study was to determine the cartilage contact mechanics and the associated fluid pressurisation of the hip joint under eight daily activities, using a three-dimensional finite element hip model with biphasic cartilage layers and generic geometries. Loads with spatial and temporal variations were applied over time and the time-dependent performance of the hip cartilage during walking was also evaluated. It was found that the fluid support ratio was over 90% during the majority of the cycles for all the eight activities. A reduced fluid support ratio was observed for the time at which the contact region slid towards the interior edge of the acetabular cartilage, but these occurred when the absolute level of the peak contact stress was minimal. Over 10 cycles of gait, the peak contact stress and peak fluid pressure remained constant, but a faster process of fluid exudation was observed for the interior edge region of the acetabular cartilage. The results demonstrate the excellent function of the hip cartilage within which the solid matrix is prevented from high levels of stress during activities owing to the load shared by fluid pressurisation. The findings are important in gaining a better understanding of the hip function during daily activities, as well as the pathology of hip degeneration and potential for future interventions. They provide a basis for future subject-specific biphasic investigations of hip performance during activities. SAGE Publications 2014-06 /pmc/articles/PMC4361357/ /pubmed/24898443 http://dx.doi.org/10.1177/0954411914537617 Text en © IMechE 2014 http://creativecommons.org/licenses/by/3.0/ This article is distributed under the terms of the Creative Commons Attribution 3.0 License (http://www.creativecommons.org/licenses/by/3.0/) which permits any use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access page (http://www.uk.sagepub.com/aboutus/openaccess.htm).
spellingShingle Original Articles
Li, Junyan
Hua, Xijin
Jin, Zhongmin
Fisher, John
Wilcox, Ruth K
Biphasic investigation of contact mechanics in natural human hips during activities
title Biphasic investigation of contact mechanics in natural human hips during activities
title_full Biphasic investigation of contact mechanics in natural human hips during activities
title_fullStr Biphasic investigation of contact mechanics in natural human hips during activities
title_full_unstemmed Biphasic investigation of contact mechanics in natural human hips during activities
title_short Biphasic investigation of contact mechanics in natural human hips during activities
title_sort biphasic investigation of contact mechanics in natural human hips during activities
topic Original Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4361357/
https://www.ncbi.nlm.nih.gov/pubmed/24898443
http://dx.doi.org/10.1177/0954411914537617
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