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Effects of acetabular resurfacing component material and fixation on the strain distribution in the pelvis

Thompson, Mark LU ; Northmore-Ball, MD and Tanner, KE (2002) In Proceedings of the Institution of Mechanical Engineers. Part H: Journal of Engineering in Medicine 216(H4). p.237-245
Abstract
A 3D finite element (FE) model of an implanted pelvis was developed as part of a project investigating an all-polymer hip resurfacing design. The model was used to compare this novel design with a metal-on-metal design in current use and a metal-on-polymer design typical of early resurfacing implants. The model included forces representing the actions of 22 muscles as well as variable cancellous bone stiffness and variable cortical shell thickness. The hip joint reaction force was applied via contact modelled between the femoral and acetabular components of the resurfacing prosthesis. Five load cases representing time points through the gait cycle were analysed. The effect of varying fixation conditions was also investigated. The highest... (More)
A 3D finite element (FE) model of an implanted pelvis was developed as part of a project investigating an all-polymer hip resurfacing design. The model was used to compare this novel design with a metal-on-metal design in current use and a metal-on-polymer design typical of early resurfacing implants. The model included forces representing the actions of 22 muscles as well as variable cancellous bone stiffness and variable cortical shell thickness. The hip joint reaction force was applied via contact modelled between the femoral and acetabular components of the resurfacing prosthesis. Five load cases representing time points through the gait cycle were analysed. The effect of varying fixation conditions was also investigated. The highest cancellous bone strain levels were found at mid-stance, not heel-strike. Remote from the acetabulum there was little effect of prosthesis material and fixation upon the von Mises stresses and maximum principal strains. Implant material appeared to have little effect upon cancellous bone strain failure with both bonded and unbonded bone-implant interfaces. The unbonded implants increased stresses in the subchondral bone at the centre of the acetabulum and increased cancellous bone loading, resembling behaviour obtained previously for the intact acetabulum. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
hip, pre-clinical testing, resurfacing, finite element analysis, replacement
in
Proceedings of the Institution of Mechanical Engineers. Part H: Journal of Engineering in Medicine
volume
216
issue
H4
pages
237 - 245
publisher
Mechanical Engineering Publications For The Institution Of Mechanical Engineers
external identifiers
  • pmid:12206520
  • wos:000177538600003
  • scopus:0036048713
ISSN
0954-4119
DOI
10.1243/09544110260138727
language
English
LU publication?
yes
id
4d909f90-afe6-4079-8f68-9698c3c406d4 (old id 330258)
date added to LUP
2007-11-15 15:37:30
date last changed
2017-12-03 03:42:13
@article{4d909f90-afe6-4079-8f68-9698c3c406d4,
  abstract     = {A 3D finite element (FE) model of an implanted pelvis was developed as part of a project investigating an all-polymer hip resurfacing design. The model was used to compare this novel design with a metal-on-metal design in current use and a metal-on-polymer design typical of early resurfacing implants. The model included forces representing the actions of 22 muscles as well as variable cancellous bone stiffness and variable cortical shell thickness. The hip joint reaction force was applied via contact modelled between the femoral and acetabular components of the resurfacing prosthesis. Five load cases representing time points through the gait cycle were analysed. The effect of varying fixation conditions was also investigated. The highest cancellous bone strain levels were found at mid-stance, not heel-strike. Remote from the acetabulum there was little effect of prosthesis material and fixation upon the von Mises stresses and maximum principal strains. Implant material appeared to have little effect upon cancellous bone strain failure with both bonded and unbonded bone-implant interfaces. The unbonded implants increased stresses in the subchondral bone at the centre of the acetabulum and increased cancellous bone loading, resembling behaviour obtained previously for the intact acetabulum.},
  author       = {Thompson, Mark and Northmore-Ball, MD and Tanner, KE},
  issn         = {0954-4119},
  keyword      = {hip,pre-clinical testing,resurfacing,finite element analysis,replacement},
  language     = {eng},
  number       = {H4},
  pages        = {237--245},
  publisher    = {Mechanical Engineering Publications For The Institution Of Mechanical Engineers},
  series       = {Proceedings of the Institution of Mechanical Engineers. Part H: Journal of Engineering in Medicine},
  title        = {Effects of acetabular resurfacing component material and fixation on the strain distribution in the pelvis},
  url          = {http://dx.doi.org/10.1243/09544110260138727},
  volume       = {216},
  year         = {2002},
}