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Sensitivity analysis of a cemented hip stem to implant position and cement mantle thickness

Sensitivity analysis of a cemented hip stem to implant position and cement mantle thickness
Sensitivity analysis of a cemented hip stem to implant position and cement mantle thickness
Patient-specific finite element models of the implanted proximal femur can be built from pre-operative computed tomography scans and post-operative X-rays. However, estimating three-dimensional positioning from two-dimensional radiographs introduces uncertainty in the implant position. Further, accurately measuring the thin cement mantle and the degree of cement–bone interdigitation from imaging data is challenging. To quantify the effect of these uncertainties in stem position and cement thickness, a sensitivity study was performed. A design-of-experiment study was implemented, simulating both gait and stair ascent. Cement mantle stresses and bone–implant interface strains were monitored. The results show that small variations in alignment affect the implant biomechanics, especially around the most proximal and most distal ends of the stem. The results suggest that implant position is more influential than cement thickness. Rotation around the medial–lateral axis is the dominant factor in the proximal zones and stem translations are the dominant factors around the distal tip
1025-5842
1671-1684
Shi, Junfen
ccf07607-3ee9-4c29-b326-4f9685fa1a6e
Browne, Martin
6578cc37-7bd6-43b9-ae5c-77ccb7726397
Strickland, Michael A.
6b639de6-cb09-4383-bf06-576eb6aef448
Flivik, Gunnar
c7acb982-7bc9-49fc-bcd4-d9c61e5adc4d
Taylor, Mark
e368bda3-6ca5-4178-80e9-41a689badeeb
Shi, Junfen
ccf07607-3ee9-4c29-b326-4f9685fa1a6e
Browne, Martin
6578cc37-7bd6-43b9-ae5c-77ccb7726397
Strickland, Michael A.
6b639de6-cb09-4383-bf06-576eb6aef448
Flivik, Gunnar
c7acb982-7bc9-49fc-bcd4-d9c61e5adc4d
Taylor, Mark
e368bda3-6ca5-4178-80e9-41a689badeeb

Shi, Junfen, Browne, Martin, Strickland, Michael A., Flivik, Gunnar and Taylor, Mark (2013) Sensitivity analysis of a cemented hip stem to implant position and cement mantle thickness. Computer Methods in Biomechanics and Biomedical Engineering, 17 (15), 1671-1684. (doi:10.1080/10255842.2012.761693). (PMID:23405986)

Record type: Article

Abstract

Patient-specific finite element models of the implanted proximal femur can be built from pre-operative computed tomography scans and post-operative X-rays. However, estimating three-dimensional positioning from two-dimensional radiographs introduces uncertainty in the implant position. Further, accurately measuring the thin cement mantle and the degree of cement–bone interdigitation from imaging data is challenging. To quantify the effect of these uncertainties in stem position and cement thickness, a sensitivity study was performed. A design-of-experiment study was implemented, simulating both gait and stair ascent. Cement mantle stresses and bone–implant interface strains were monitored. The results show that small variations in alignment affect the implant biomechanics, especially around the most proximal and most distal ends of the stem. The results suggest that implant position is more influential than cement thickness. Rotation around the medial–lateral axis is the dominant factor in the proximal zones and stem translations are the dominant factors around the distal tip

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Accepted/In Press date: 19 December 2012
Published date: 13 February 2013
Organisations: Bioengineering Group

Identifiers

Local EPrints ID: 374113
URI: http://eprints.soton.ac.uk/id/eprint/374113
ISSN: 1025-5842
PURE UUID: a48bc955-5e0b-45ac-bab5-cfbd676d8e6f
ORCID for Martin Browne: ORCID iD orcid.org/0000-0001-5184-050X

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Date deposited: 06 Feb 2015 10:43
Last modified: 20 Jul 2019 01:17

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Contributors

Author: Junfen Shi
Author: Martin Browne ORCID iD
Author: Michael A. Strickland
Author: Gunnar Flivik
Author: Mark Taylor

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