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Fluid load support does not explain tribological performance of PVA hydrogels

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Title: Fluid load support does not explain tribological performance of PVA hydrogels
Authors: Porte, E
Cann, P
Masen, M
Item Type: Journal Article
Abstract: The application of hydrogels as articular cartilage (AC) repair or replacement materials is limited by poor tribological behaviour, as it does not match that of native AC. In cartilage, the pressurisation of the interstitial fluid is thought to be crucial for the low friction as the load is shared between the solid and liquid phase of the material. This fluid load support theory is also often applied to hydrogels. However, this theory has not been validated as no experimental evidence directly relates the pressurisation of the interstitial fluid to the frictional response of hydrogels. This lack of understanding about the governing tribological mechanisms in hydrogels limits their optimised design. Therefore, this paper aims to provide a direct measure for fluid load support in hydrogels under physiologically relevant sliding conditions. A photoelastic method was developed to simultaneously measure the load on the solid phase of the hydrogel and its friction coefficient and thus directly relate friction and fluid load support. The results showed a clear distinction in frictional behaviour between the different test conditions, but results from photoelastic images and stress-relaxation experiments indicated that fluid load support is an unlikely explanation for the frictional response of the hydrogels. A more appropriate explanation, we hypothesized, is a non-replenished lubricant mechanism. This work has important implications for the tribology of cartilage and hydrogels as it shows that the existing theories do not adequately describe the tribological behaviour of hydrogels. The developed insights can be used to optimise the tribological performance of hydrogels as articular cartilage implants.
Issue Date: 1-Feb-2019
Date of Acceptance: 30-Sep-2018
URI: http://hdl.handle.net/10044/1/65175
DOI: 10.1016/j.jmbbm.2018.09.048
ISSN: 1751-6161
Publisher: Elsevier
Start Page: 284
End Page: 294
Journal / Book Title: Journal of The Mechanical Behavior of Biomedical Materials
Volume: 90
Issue: 1
Copyright Statement: © 2018 Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence http://creativecommons.org/licenses/by-nc-nd/4.0/
Keywords: Articular cartilage
Fluid load support
Friction
Hydrogel
Lubrication
Photoelastic
Science & Technology
Technology
Engineering, Biomedical
Materials Science, Biomaterials
Engineering
Materials Science
Fluid load support
Lubrication
Hydrogel
Photoelastic
Friction
Articular cartilage
STARVED REGIMES
CONTACT AREA
LOW-FRICTION
CARTILAGE
LUBRICATION
PRESSURIZATION
TRANSITION
REPAIR
JOINTS
Articular cartilage
Fluid load support
Friction
Hydrogel
Lubrication
Photoelastic
Biomimetic Materials
Cartilage, Articular
Elasticity
Friction
Hydrogels
Materials Testing
Polyvinyl Alcohol
Stress, Mechanical
Weight-Bearing
Cartilage, Articular
Polyvinyl Alcohol
Hydrogels
Materials Testing
Elasticity
Friction
Stress, Mechanical
Weight-Bearing
Biomimetic Materials
0903 Biomedical Engineering
0912 Materials Engineering
0913 Mechanical Engineering
Biomedical Engineering
Publication Status: Published
Conference Place: Netherlands
Online Publication Date: 2018-10-21
Appears in Collections:Mechanical Engineering
Faculty of Engineering