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Effect of microseparation on contact mechanics in metal‐on‐metal hip replacements—A finite element analysis

Some early failures of metal‐on‐metal (MoM) hip replacements associated with elevated wear have caused concerns for the use of this bearing combination. Simulator studies have shown that microseparation and its associated rim contact and edge loading may produce the most severe wear in MoM bearings....

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Autores principales: Liu, Feng, Williams, Sophie, Fisher, John
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4737106/
https://www.ncbi.nlm.nih.gov/pubmed/25370809
http://dx.doi.org/10.1002/jbm.b.33313
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author Liu, Feng
Williams, Sophie
Fisher, John
author_facet Liu, Feng
Williams, Sophie
Fisher, John
author_sort Liu, Feng
collection PubMed
description Some early failures of metal‐on‐metal (MoM) hip replacements associated with elevated wear have caused concerns for the use of this bearing combination. Simulator studies have shown that microseparation and its associated rim contact and edge loading may produce the most severe wear in MoM bearings. It is generally recognized that this high wear can be attributed to the high contact stress of the head on the rim of the cup. In this study, an improved finite element contact model that incorporates an elastic‐perfectly plastic material property for cobalt‐chrome alloy of the metal bearing was developed in an attempt to provide an accurate prediction of the stress and strain for the rim contact. The effects of the microseparation displacement (0.1−2 mm), cup inclination angle (25−65°) and cup rim radius (0.5−4 mm) on the contact stress/strain were investigated. The results show that a translational displacement >0.1 mm under a load >0.5 kN can produce a highly concentrated contact stress at the surface of the cup rim which can lead to plastic deformation. This study also suggests that the magnitude of translational displacement was the major factor that determined the severity of the contact conditions and level of stress and strain under microseparation conditions. Future studies will address the effect of surgical translational and rotational malposition and component design on the magnitude of microseparation, contact stress and strain and severity of wear. © 2014 The Authors. Journal of Biomedical Materials Research Part B: Applied Biomaterials Published by Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 103B: 1312–1319, 2015.
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spelling pubmed-47371062016-02-11 Effect of microseparation on contact mechanics in metal‐on‐metal hip replacements—A finite element analysis Liu, Feng Williams, Sophie Fisher, John J Biomed Mater Res B Appl Biomater Original Research Reports Some early failures of metal‐on‐metal (MoM) hip replacements associated with elevated wear have caused concerns for the use of this bearing combination. Simulator studies have shown that microseparation and its associated rim contact and edge loading may produce the most severe wear in MoM bearings. It is generally recognized that this high wear can be attributed to the high contact stress of the head on the rim of the cup. In this study, an improved finite element contact model that incorporates an elastic‐perfectly plastic material property for cobalt‐chrome alloy of the metal bearing was developed in an attempt to provide an accurate prediction of the stress and strain for the rim contact. The effects of the microseparation displacement (0.1−2 mm), cup inclination angle (25−65°) and cup rim radius (0.5−4 mm) on the contact stress/strain were investigated. The results show that a translational displacement >0.1 mm under a load >0.5 kN can produce a highly concentrated contact stress at the surface of the cup rim which can lead to plastic deformation. This study also suggests that the magnitude of translational displacement was the major factor that determined the severity of the contact conditions and level of stress and strain under microseparation conditions. Future studies will address the effect of surgical translational and rotational malposition and component design on the magnitude of microseparation, contact stress and strain and severity of wear. © 2014 The Authors. Journal of Biomedical Materials Research Part B: Applied Biomaterials Published by Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 103B: 1312–1319, 2015. John Wiley and Sons Inc. 2014-11-05 2015-08 /pmc/articles/PMC4737106/ /pubmed/25370809 http://dx.doi.org/10.1002/jbm.b.33313 Text en © 2014 The Authors. Journal of Biomedical Materials Research Part B: Applied Biomaterials Published by Wiley Periodicals, Inc. This is an open access article under the terms of the Creative Commons Attribution (http://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Original Research Reports
Liu, Feng
Williams, Sophie
Fisher, John
Effect of microseparation on contact mechanics in metal‐on‐metal hip replacements—A finite element analysis
title Effect of microseparation on contact mechanics in metal‐on‐metal hip replacements—A finite element analysis
title_full Effect of microseparation on contact mechanics in metal‐on‐metal hip replacements—A finite element analysis
title_fullStr Effect of microseparation on contact mechanics in metal‐on‐metal hip replacements—A finite element analysis
title_full_unstemmed Effect of microseparation on contact mechanics in metal‐on‐metal hip replacements—A finite element analysis
title_short Effect of microseparation on contact mechanics in metal‐on‐metal hip replacements—A finite element analysis
title_sort effect of microseparation on contact mechanics in metal‐on‐metal hip replacements—a finite element analysis
topic Original Research Reports
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4737106/
https://www.ncbi.nlm.nih.gov/pubmed/25370809
http://dx.doi.org/10.1002/jbm.b.33313
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