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Measurement of internal implantation strains in analogue bone using DVC

Measurement of internal implantation strains in analogue bone using DVC
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 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.
Analogue bone, Cementless implant, Digital Volume Correlation (DVC), FE modelling, Micro-CT
1-18
Marter, Alexander
58759fea-80f7-4c31-b76f-36da5e5ae9fd
Burson-Thomas, Charles
2bacf260-3637-4943-9816-3d8f18c24eb7
Dickinson, Alexander
10151972-c1b5-4f7d-bc12-6482b5870cad
Rankin, Kathryn
d9516566-0ad8-473d-b99b-4683c663a2b7
Mavrogordato, Mark
f3e0879b-118a-463a-a130-1c890e9ab547
Pierron, Fabrice
a1fb4a70-6f34-4625-bc23-fcb6996b79b4
Browne, Martin
6578cc37-7bd6-43b9-ae5c-77ccb7726397
Marter, Alexander
58759fea-80f7-4c31-b76f-36da5e5ae9fd
Burson-Thomas, Charles
2bacf260-3637-4943-9816-3d8f18c24eb7
Dickinson, Alexander
10151972-c1b5-4f7d-bc12-6482b5870cad
Rankin, Kathryn
d9516566-0ad8-473d-b99b-4683c663a2b7
Mavrogordato, Mark
f3e0879b-118a-463a-a130-1c890e9ab547
Pierron, Fabrice
a1fb4a70-6f34-4625-bc23-fcb6996b79b4
Browne, Martin
6578cc37-7bd6-43b9-ae5c-77ccb7726397

Marter, Alexander, Burson-Thomas, Charles, Dickinson, Alexander, Rankin, Kathryn, Mavrogordato, Mark, Pierron, Fabrice and Browne, Martin (2020) Measurement of internal implantation strains in analogue bone using DVC. Materials, 13 (18), 1-18, [4050]. (doi:10.3390/ma13184050).

Record type: Article

Abstract

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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Submitted date: 1 August 2020
Accepted/In Press date: 8 September 2020
e-pub ahead of print date: 12 September 2020
Published date: September 2020
Keywords: Analogue bone, Cementless implant, Digital Volume Correlation (DVC), FE modelling, Micro-CT

Identifiers

Local EPrints ID: 444245
URI: http://eprints.soton.ac.uk/id/eprint/444245
PURE UUID: 0aaf488b-2618-4923-9eb1-6bf63012adfd
ORCID for Alexander Dickinson: ORCID iD orcid.org/0000-0002-9647-1944
ORCID for Kathryn Rankin: ORCID iD orcid.org/0000-0002-8458-1038
ORCID for Fabrice Pierron: ORCID iD orcid.org/0000-0003-2813-4994
ORCID for Martin Browne: ORCID iD orcid.org/0000-0001-5184-050X

Catalogue record

Date deposited: 02 Oct 2020 16:37
Last modified: 26 Nov 2021 02:58

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Contributors

Author: Alexander Marter
Author: Kathryn Rankin ORCID iD
Author: Fabrice Pierron ORCID iD
Author: Martin Browne ORCID iD

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