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

Mark Thompson, MD Northmore-Ball, KE Tanner

Research output: Contribution to journalArticlepeer-review

44 Citations (SciVal)

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.
Original languageEnglish
Pages (from-to)237-245
JournalProceedings of the Institution of Mechanical Engineers. Part H: Journal of Engineering in Medicine
Volume216
Issue numberH4
DOIs
Publication statusPublished - 2002

Subject classification (UKÄ)

  • Orthopedics

Keywords

  • hip
  • pre-clinical testing
  • resurfacing
  • finite element analysis
  • replacement

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