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A large scale finite element study of a cementless osseointegrated tibial tray

A large scale finite element study of a cementless osseointegrated tibial tray
A large scale finite element study of a cementless osseointegrated tibial tray
The aim of this study was to investigate the performance of a cementless osseointegrated tibial tray (P.F.C. ® Sigma®, Depuy® Inc, USA) in a general population using finite element (FE) analysis. Computational testing of total knee replacements (TKRs) typically only use a model of a single patient and assume the results can be extrapolated to the general population. In this study, two statistical models (SMs) were used; one of the shape and elastic modulus of the tibia, and one of the tibiofemoral joint loads over a gait cycle, to generate a population of FE models. A method was developed to automatically size, position and implant the tibial tray in each tibia, and 328 models were successfully implanted and analysed. The peak strain in the bone of the resected surface was examined and the percentage surface area of bone above yield strain (PSAY) was used to determine the risk of failure of a model. Using an arbitrary threshold of 10% PSAY, the models were divided into two groups (‘higher risk’ and ‘lower risk’) in order to explore factors that may influence potential failure. In this study, 17% of models were in the ‘higher risk’ group and it was found that these models had a lower elastic modulus (mean 275.7MPa), a higher weight (mean 85.3kg), and larger peak loads, of which the axial force was the most significant. This study showed the mean peak strain of the resected surface and PSAY were not significantly different between implant sizes
0021-9290
1900-1906
Galloway, Francis
9efdb46e-a0b9-4454-b28f-493c49bf7b14
Kahnt, Max
0c866678-e72e-4463-9968-6736db07a745
Ramm, Heiko
816de14e-af42-4eeb-a3ec-b9b36a603103
Worsley, Peter
6d33aee3-ef43-468d-aef6-86d190de6756
Zachow, Stefan
d3361c36-1a25-4c80-b246-58d9b0a6bdad
Nair, P.B.
d4d61705-bc97-478e-9e11-bcef6683afe7
Taylor, M.
e368bda3-6ca5-4178-80e9-41a689badeeb
Galloway, Francis
9efdb46e-a0b9-4454-b28f-493c49bf7b14
Kahnt, Max
0c866678-e72e-4463-9968-6736db07a745
Ramm, Heiko
816de14e-af42-4eeb-a3ec-b9b36a603103
Worsley, Peter
6d33aee3-ef43-468d-aef6-86d190de6756
Zachow, Stefan
d3361c36-1a25-4c80-b246-58d9b0a6bdad
Nair, P.B.
d4d61705-bc97-478e-9e11-bcef6683afe7
Taylor, M.
e368bda3-6ca5-4178-80e9-41a689badeeb

Galloway, Francis, Kahnt, Max, Ramm, Heiko, Worsley, Peter, Zachow, Stefan, Nair, P.B. and Taylor, M. (2013) A large scale finite element study of a cementless osseointegrated tibial tray. Journal of Biomechanics, 46 (11), 1900-1906. (doi:10.1016/j.jbiomech.2013.04.021).

Record type: Article

Abstract

The aim of this study was to investigate the performance of a cementless osseointegrated tibial tray (P.F.C. ® Sigma®, Depuy® Inc, USA) in a general population using finite element (FE) analysis. Computational testing of total knee replacements (TKRs) typically only use a model of a single patient and assume the results can be extrapolated to the general population. In this study, two statistical models (SMs) were used; one of the shape and elastic modulus of the tibia, and one of the tibiofemoral joint loads over a gait cycle, to generate a population of FE models. A method was developed to automatically size, position and implant the tibial tray in each tibia, and 328 models were successfully implanted and analysed. The peak strain in the bone of the resected surface was examined and the percentage surface area of bone above yield strain (PSAY) was used to determine the risk of failure of a model. Using an arbitrary threshold of 10% PSAY, the models were divided into two groups (‘higher risk’ and ‘lower risk’) in order to explore factors that may influence potential failure. In this study, 17% of models were in the ‘higher risk’ group and it was found that these models had a lower elastic modulus (mean 275.7MPa), a higher weight (mean 85.3kg), and larger peak loads, of which the axial force was the most significant. This study showed the mean peak strain of the resected surface and PSAY were not significantly different between implant sizes

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Published date: 26 July 2013
Organisations: Faculty of Medicine, Bioengineering Group

Identifiers

Local EPrints ID: 353766
URI: http://eprints.soton.ac.uk/id/eprint/353766
ISSN: 0021-9290
PURE UUID: 8acfb0f9-795c-4d4c-8436-46b82fbf014a
ORCID for Peter Worsley: ORCID iD orcid.org/0000-0003-0145-5042

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Date deposited: 17 Jun 2013 08:55
Last modified: 18 Feb 2021 17:11

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Contributors

Author: Francis Galloway
Author: Max Kahnt
Author: Heiko Ramm
Author: Peter Worsley ORCID iD
Author: Stefan Zachow
Author: P.B. Nair
Author: M. Taylor

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