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Measurement of Internal Implantation Strains in Analogue Bone Using DVC

The survivorship of cementless orthopaedic implants may be related to their initial stability; insufficient press-fit can lead to excessive micromotion between the implant and bone, joint pain, and surgical revision. However, too much interference between implant and bone can produce excessive strai...

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Autores principales: Marter, Alexander, Burson-Thomas, Charles, Dickinson, Alexander, Rankin, Kathryn, Mavrogordato, Mark, Pierron, Fabrice, Browne, Martin
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7559792/
https://www.ncbi.nlm.nih.gov/pubmed/32932608
http://dx.doi.org/10.3390/ma13184050
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author Marter, Alexander
Burson-Thomas, Charles
Dickinson, Alexander
Rankin, Kathryn
Mavrogordato, Mark
Pierron, Fabrice
Browne, Martin
author_facet Marter, Alexander
Burson-Thomas, Charles
Dickinson, Alexander
Rankin, Kathryn
Mavrogordato, Mark
Pierron, Fabrice
Browne, Martin
author_sort Marter, Alexander
collection PubMed
description The survivorship of cementless orthopaedic implants may be related to their initial stability; insufficient press-fit can lead to excessive micromotion between the implant and bone, joint pain, and surgical revision. However, too much interference between implant and bone can produce excessive strains and damage the bone, which also compromises stability. An understanding of the nature and mechanisms of strain generation during implantation would therefore be valuable. Previous measurements of implantation strain have been limited to local discrete or surface measurements. In this work, we devise a Digital Volume Correlation (DVC) methodology to measure the implantation strain throughout the volume. A simplified implant model was implanted into analogue bone media using a customised loading rig, and a micro-CT protocol optimised to minimise artefacts due to the presence of the implant. The measured strains were interpreted by FE modelling of the displacement-controlled implantation, using a bilinear elastoplastic constitutive model for the analogue bone. The coefficient of friction between the implant and bone was determined using the experimental measurements of the reaction force. Large strains at the interface between the analogue bone and implant produced localised deterioration of the correlation coefficient, compromising the ability to measure strains in this region. Following correlation coefficient thresholding (removing strains with a coefficient less than 0.9), the observed strain patterns were similar between the DVC and FE. However, the magnitude of FE strains was approximately double those measured experimentally. This difference suggests the need for improvements in the interface failure model, for example, to account for localised buckling of the cellular analogue bone structure. A further recommendation from this work is that future DVC experiments involving similar geometries and structures should employ a subvolume size of 0.97 mm as a starting point.
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spelling pubmed-75597922020-10-29 Measurement of Internal Implantation Strains in Analogue Bone Using DVC Marter, Alexander Burson-Thomas, Charles Dickinson, Alexander Rankin, Kathryn Mavrogordato, Mark Pierron, Fabrice Browne, Martin Materials (Basel) Article The survivorship of cementless orthopaedic implants may be related to their initial stability; insufficient press-fit can lead to excessive micromotion between the implant and bone, joint pain, and surgical revision. However, too much interference between implant and bone can produce excessive strains and damage the bone, which also compromises stability. An understanding of the nature and mechanisms of strain generation during implantation would therefore be valuable. Previous measurements of implantation strain have been limited to local discrete or surface measurements. In this work, we devise a Digital Volume Correlation (DVC) methodology to measure the implantation strain throughout the volume. A simplified implant model was implanted into analogue bone media using a customised loading rig, and a micro-CT protocol optimised to minimise artefacts due to the presence of the implant. The measured strains were interpreted by FE modelling of the displacement-controlled implantation, using a bilinear elastoplastic constitutive model for the analogue bone. The coefficient of friction between the implant and bone was determined using the experimental measurements of the reaction force. Large strains at the interface between the analogue bone and implant produced localised deterioration of the correlation coefficient, compromising the ability to measure strains in this region. Following correlation coefficient thresholding (removing strains with a coefficient less than 0.9), the observed strain patterns were similar between the DVC and FE. However, the magnitude of FE strains was approximately double those measured experimentally. This difference suggests the need for improvements in the interface failure model, for example, to account for localised buckling of the cellular analogue bone structure. A further recommendation from this work is that future DVC experiments involving similar geometries and structures should employ a subvolume size of 0.97 mm as a starting point. MDPI 2020-09-12 /pmc/articles/PMC7559792/ /pubmed/32932608 http://dx.doi.org/10.3390/ma13184050 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Marter, Alexander
Burson-Thomas, Charles
Dickinson, Alexander
Rankin, Kathryn
Mavrogordato, Mark
Pierron, Fabrice
Browne, Martin
Measurement of Internal Implantation Strains in Analogue Bone Using DVC
title Measurement of Internal Implantation Strains in Analogue Bone Using DVC
title_full Measurement of Internal Implantation Strains in Analogue Bone Using DVC
title_fullStr Measurement of Internal Implantation Strains in Analogue Bone Using DVC
title_full_unstemmed Measurement of Internal Implantation Strains in Analogue Bone Using DVC
title_short Measurement of Internal Implantation Strains in Analogue Bone Using DVC
title_sort measurement of internal implantation strains in analogue bone using dvc
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7559792/
https://www.ncbi.nlm.nih.gov/pubmed/32932608
http://dx.doi.org/10.3390/ma13184050
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