Transient mixed lubrication model of the human knee implant

Abstract The human knee implant is computationally modelled in the mixed lubrication regime to investigate the tribological performance of the implant. This model includes the complex geometry of the implant components, unlike elliptical contact models that approximate this geometry. Film thickness...

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Autores principales:	Hamza Butt, Lee Nissim, Leiming Gao, Connor Myant, Greg deBoer, Robert Hewson
Formato:	article
Lenguaje:	EN
Publicado:	Wiley 2021
Materias:	complex geometry knee implant mixed lubrication modelling surface roughness transient Biotechnology TP248.13-248.65 Biochemistry QD415-436
Acceso en línea:	https://doaj.org/article/821636b7273549028c028b80b32ffdd8
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id	oai:doaj.org-article:821636b7273549028c028b80b32ffdd8
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spelling	oai:doaj.org-article:821636b7273549028c028b80b32ffdd82021-11-12T15:58:03ZTransient mixed lubrication model of the human knee implant2405-451810.1049/bsb2.12020https://doaj.org/article/821636b7273549028c028b80b32ffdd82021-12-01T00:00:00Zhttps://doi.org/10.1049/bsb2.12020https://doaj.org/toc/2405-4518Abstract The human knee implant is computationally modelled in the mixed lubrication regime to investigate the tribological performance of the implant. This model includes the complex geometry of the implant components, unlike elliptical contact models that approximate this geometry. Film thickness and pressure results are presented for an ISO gait cycle to determine the lubrication regime present within the implant during its operation. It was found that it was possible for the lubrication regime to span between elastohydrodynamic, mixed and boundary lubrication depending on the operating conditions of the implant. It was observed that the tribological conditions present in one condyle were not necessarily representative of the other. Multiple points of contact were found within the same condyle, which cannot be computed by the elliptical contact solvers. This model can be used to balance forces in all directions, instead of only the normal loads, as often done in elliptical contact models. This work is an initial step towards understanding the role of the complex geometry in the tribological characteristics of the human knee implant when operating in physiological conditions.Hamza ButtLee NissimLeiming GaoConnor MyantGreg deBoerRobert HewsonWileyarticlecomplex geometryknee implantmixed lubrication modellingsurface roughnesstransientBiotechnologyTP248.13-248.65BiochemistryQD415-436ENBiosurface and Biotribology, Vol 7, Iss 4, Pp 206-218 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	complex geometry knee implant mixed lubrication modelling surface roughness transient Biotechnology TP248.13-248.65 Biochemistry QD415-436
spellingShingle	complex geometry knee implant mixed lubrication modelling surface roughness transient Biotechnology TP248.13-248.65 Biochemistry QD415-436 Hamza Butt Lee Nissim Leiming Gao Connor Myant Greg deBoer Robert Hewson Transient mixed lubrication model of the human knee implant
description	Abstract The human knee implant is computationally modelled in the mixed lubrication regime to investigate the tribological performance of the implant. This model includes the complex geometry of the implant components, unlike elliptical contact models that approximate this geometry. Film thickness and pressure results are presented for an ISO gait cycle to determine the lubrication regime present within the implant during its operation. It was found that it was possible for the lubrication regime to span between elastohydrodynamic, mixed and boundary lubrication depending on the operating conditions of the implant. It was observed that the tribological conditions present in one condyle were not necessarily representative of the other. Multiple points of contact were found within the same condyle, which cannot be computed by the elliptical contact solvers. This model can be used to balance forces in all directions, instead of only the normal loads, as often done in elliptical contact models. This work is an initial step towards understanding the role of the complex geometry in the tribological characteristics of the human knee implant when operating in physiological conditions.
format	article
author	Hamza Butt Lee Nissim Leiming Gao Connor Myant Greg deBoer Robert Hewson
author_facet	Hamza Butt Lee Nissim Leiming Gao Connor Myant Greg deBoer Robert Hewson
author_sort	Hamza Butt
title	Transient mixed lubrication model of the human knee implant
title_short	Transient mixed lubrication model of the human knee implant
title_full	Transient mixed lubrication model of the human knee implant
title_fullStr	Transient mixed lubrication model of the human knee implant
title_full_unstemmed	Transient mixed lubrication model of the human knee implant
title_sort	transient mixed lubrication model of the human knee implant
publisher	Wiley
publishDate	2021
url	https://doaj.org/article/821636b7273549028c028b80b32ffdd8
work_keys_str_mv	AT hamzabutt transientmixedlubricationmodelofthehumankneeimplant AT leenissim transientmixedlubricationmodelofthehumankneeimplant AT leiminggao transientmixedlubricationmodelofthehumankneeimplant AT connormyant transientmixedlubricationmodelofthehumankneeimplant AT gregdeboer transientmixedlubricationmodelofthehumankneeimplant AT roberthewson transientmixedlubricationmodelofthehumankneeimplant
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Transient mixed lubrication model of the human knee implant

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