Biphasic investigation of contact mechanics in natural human hips during activities

Li, Junyan ORCID logoORCID:, Hua, Xijin, Jin, Zhongmin, Fisher, John and Wilcox, Ruth K. (2014) Biphasic investigation of contact mechanics in natural human hips during activities. Proceedings of the Institution of Mechanical Engineers. Part H, Journal of engineering in medicine, 228 (6) . pp. 556-563. ISSN 2041-3033 [Article] (doi:10.1177/0954411914537617)

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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.

Item Type: Article
Research Areas: A. > School of Science and Technology > Natural Sciences > Biophysics and Bioengineering group
Item ID: 21906
Notes on copyright: This article is distributed under the terms of the Creative Commons Attribution 3.0 License ( 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 (
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Depositing User: Junyan Li
Date Deposited: 05 Jun 2017 15:44
Last Modified: 29 Nov 2022 23:31

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