Wear characteristics of an unconstrained lumbar total disc replacement under a range of in vitro test conditions

Philip J. Hyde; John Fisher; Richard M. Hall

doi:10.1002/jbm.b.33456

Wear characteristics of an unconstrained lumbar total disc replacement under a range of in vitro test conditions

Philip J. Hyde^*, John Fisher, Richard M. Hall

^*Corresponding author for this work

Engineering

Research output: Contribution to journal › Article › peer-review

Abstract

The effect of kinematics, loading and centre of rotation on the wear of an unconstrained total disc replacement have been investigated using the ISO 18192-1 standard test as a baseline. Mean volumetric wear rate and surface morphological effects were reported. Changing the phasing of the flexions to create a low (but finite) amount of crossing path motion at the bearing surfaces resulted in a significant fall in wear volume. However, the rate of wear was still much larger than previously reported values under zero cross shear conditions. Reducing the load did not result in a significant change in wear rate. Moving the centre of rotation of the disc inferiorly did significantly increase wear rate. A phenomenon of debris re-attachment on the UHMWPE surface was observed and hypothesised to be due to a relatively harsh tribological operating regime in which lubricant replenishment and particle migration out of the bearing contact zone were limited.

Original language	English
Pages (from-to)	46-52
Number of pages	7
Journal	Journal of Biomedical Materials Research - Part B Applied Biomaterials
Volume	105
Issue number	1
DOIs	https://doi.org/10.1002/jbm.b.33456
Publication status	Published - 1 Jan 2017

Bibliographical note

Funding Information:
The CHARITÉ discs were provided by DePuy Spine, Raynham, MA Philip Hyde was supported by the EPSRC grant number EP/P504988/1. John Fisher is an NIHR senior investigator and supported through NIHR LMBRU Leeds Biomedical Musculoskeletal Research Unit. JF is a paid consultant to de Puy international a Johnson & Johnson company Professor Fisher and Professor Hall are supported through the Leeds Centre of Excellence in Medical Engineering funded by the Wellcome Trust and EPSRC (WELMEC), grant number WT 088908/Z/09/Z. Adrian Eagles and Rachel Vicars are thanked for their advice on metrology and simulation respectively.

Publisher Copyright:
© 2015 The Authors Journal of Biomedical Materials Research Part B: Applied Biomaterials Published by Wiley Periodicals, Inc.

Keywords

biotribology
Charité
in motion artificial disc
Prodisc
TDR
total disc replacement
tribology
wear

ASJC Scopus subject areas

Biomaterials
Biomedical Engineering

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Cite this

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abstract = "The effect of kinematics, loading and centre of rotation on the wear of an unconstrained total disc replacement have been investigated using the ISO 18192-1 standard test as a baseline. Mean volumetric wear rate and surface morphological effects were reported. Changing the phasing of the flexions to create a low (but finite) amount of crossing path motion at the bearing surfaces resulted in a significant fall in wear volume. However, the rate of wear was still much larger than previously reported values under zero cross shear conditions. Reducing the load did not result in a significant change in wear rate. Moving the centre of rotation of the disc inferiorly did significantly increase wear rate. A phenomenon of debris re-attachment on the UHMWPE surface was observed and hypothesised to be due to a relatively harsh tribological operating regime in which lubricant replenishment and particle migration out of the bearing contact zone were limited.",

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Wear characteristics of an unconstrained lumbar total disc replacement under a range of in vitro test conditions

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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