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

Shi, J.; Browne, M.; Strickland, M.; Flivik, Gunnar LU and Taylor, M. (2014) In Computer Methods in Biomechanics and Biomedical Engineering 17(15). p.1671-1684
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... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
total hip replacement, sensitivity, finite element analysis, design-of-experiment, implant alignment
in
Computer Methods in Biomechanics and Biomedical Engineering
volume
17
issue
15
pages
1671 - 1684
publisher
Taylor & Francis
external identifiers
  • wos:000337530300004
  • scopus:84901626202
ISSN
1025-5842
DOI
10.1080/10255842.2012.761693
language
English
LU publication?
yes
id
bcb60bc8-d4be-4680-bb27-4cd6873df6dd (old id 4548086)
date added to LUP
2014-08-01 07:37:22
date last changed
2017-06-25 03:03:04
@article{bcb60bc8-d4be-4680-bb27-4cd6873df6dd,
  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.},
  author       = {Shi, J. and Browne, M. and Strickland, M. and Flivik, Gunnar and Taylor, M.},
  issn         = {1025-5842},
  keyword      = {total hip replacement,sensitivity,finite element analysis,design-of-experiment,implant alignment},
  language     = {eng},
  number       = {15},
  pages        = {1671--1684},
  publisher    = {Taylor & Francis},
  series       = {Computer Methods in Biomechanics and Biomedical Engineering},
  title        = {Sensitivity analysis of a cemented hip stem to implant position and cement mantle thickness},
  url          = {http://dx.doi.org/10.1080/10255842.2012.761693},
  volume       = {17},
  year         = {2014},
}