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Decreased stress shielding with a PEEK femoral total knee prosthesis measured in validated computational models

Decreased stress shielding with a PEEK femoral total knee prosthesis measured in validated computational models
Decreased stress shielding with a PEEK femoral total knee prosthesis measured in validated computational models
Due to their high stiffness, metal femoral implants in total knee arthroplasty may cause stress shielding of the peri-prosthetic bone, which can lead to loss of bone stock. Using a polymer (PEEK) femoral implant reduces the stiffness mismatch between implant and bone, and therefore has the potential to decrease strain shielding. The goal of the current study was to evaluate this potential benefit of PEEK femoral components in cadaveric experiments. Cadaveric femurs were loaded in a materials testing device, while a 3-D digital image correlation set-up captured strains on the surface of the intact femurs and femurs implanted with PEEK and CoCr components. These experimental results were used to validate specimen-specific finite element models, which subsequently were used to assess the effect of metal and PEEK femoral components on the bone strain energy density. The finite element models showed strain maps that were highly comparable to the experimental measurements. The PEEK implant increased strain energy density, relative to the preoperative bone and compared to CoCr. This was most pronounced in the regions directly under the implant and near load contact sites. These data confirm the hypothesis that a PEEK femoral implant can reduce peri-prosthetic stress shielding.
Digital image correlation, Finite element simulation, Polyetheretherketone, Stress shielding, Total knee arthroplasty
0021-9290
1-8
de Ruiter, Lennert
623f1c14-2c6f-4c43-815f-9b9f9a7799ee
Rankin, Kathryn
d9516566-0ad8-473d-b99b-4683c663a2b7
Browne, Martin
6578cc37-7bd6-43b9-ae5c-77ccb7726397
Briscoe, Adam
d3c0f5cd-1ed5-4265-872d-75fa4018177d
Janssen, Dennis
db6afeb1-0e0a-4e22-bcb9-1cb9a5d1fed6
Verdonschot, Nico
5dae1006-c2df-495a-af81-e5dd19c00dbb
de Ruiter, Lennert
623f1c14-2c6f-4c43-815f-9b9f9a7799ee
Rankin, Kathryn
d9516566-0ad8-473d-b99b-4683c663a2b7
Browne, Martin
6578cc37-7bd6-43b9-ae5c-77ccb7726397
Briscoe, Adam
d3c0f5cd-1ed5-4265-872d-75fa4018177d
Janssen, Dennis
db6afeb1-0e0a-4e22-bcb9-1cb9a5d1fed6
Verdonschot, Nico
5dae1006-c2df-495a-af81-e5dd19c00dbb

de Ruiter, Lennert, Rankin, Kathryn, Browne, Martin, Briscoe, Adam, Janssen, Dennis and Verdonschot, Nico (2021) Decreased stress shielding with a PEEK femoral total knee prosthesis measured in validated computational models. Journal of Biomechanics, 118, 1-8, [110270]. (doi:10.1016/j.jbiomech.2021.110270).

Record type: Article

Abstract

Due to their high stiffness, metal femoral implants in total knee arthroplasty may cause stress shielding of the peri-prosthetic bone, which can lead to loss of bone stock. Using a polymer (PEEK) femoral implant reduces the stiffness mismatch between implant and bone, and therefore has the potential to decrease strain shielding. The goal of the current study was to evaluate this potential benefit of PEEK femoral components in cadaveric experiments. Cadaveric femurs were loaded in a materials testing device, while a 3-D digital image correlation set-up captured strains on the surface of the intact femurs and femurs implanted with PEEK and CoCr components. These experimental results were used to validate specimen-specific finite element models, which subsequently were used to assess the effect of metal and PEEK femoral components on the bone strain energy density. The finite element models showed strain maps that were highly comparable to the experimental measurements. The PEEK implant increased strain energy density, relative to the preoperative bone and compared to CoCr. This was most pronounced in the regions directly under the implant and near load contact sites. These data confirm the hypothesis that a PEEK femoral implant can reduce peri-prosthetic stress shielding.

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deRuiter2021_JBiomech_accepted_manuscipt - Accepted Manuscript
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More information

Accepted/In Press date: 16 January 2021
e-pub ahead of print date: 28 January 2021
Published date: 30 March 2021
Keywords: Digital image correlation, Finite element simulation, Polyetheretherketone, Stress shielding, Total knee arthroplasty

Identifiers

Local EPrints ID: 446693
URI: http://eprints.soton.ac.uk/id/eprint/446693
ISSN: 0021-9290
PURE UUID: 6a61a13e-3a8b-47d2-903e-23a976fa2d01
ORCID for Kathryn Rankin: ORCID iD orcid.org/0000-0002-8458-1038
ORCID for Martin Browne: ORCID iD orcid.org/0000-0001-5184-050X

Catalogue record

Date deposited: 18 Feb 2021 17:30
Last modified: 26 Nov 2021 02:58

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Contributors

Author: Lennert de Ruiter
Author: Kathryn Rankin ORCID iD
Author: Martin Browne ORCID iD
Author: Adam Briscoe
Author: Dennis Janssen
Author: Nico Verdonschot

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