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Polyethylene Wear in Total Hip Arthroplasty for Suboptimal Acetabular Cup Positions and for Different Polyethylene Types: Experimental Evaluation of Wear Simulation by Finite Element Analysis Using Clinical Radiostereometric Measurements

  • Christian WongEmail author
  • Maiken Stilling
Chapter

Abstract

We have examined the effects of optimal and sub-optimal cup position and different types of polyethylene on the simulated polyethylene wear. Finite Element (FE) Analysis was used, and ultra high molecular weight (UHMWPE), highly cross-linked (HCL), and E vitamin stabilized (E-poly) polyethylene were examined. We found structural stress parameters to be three times higher for a steep cup compared with a cup in optimal position. There were no differences in predicted polyethylene wear for the three examined polyethylene liners.

We further evaluated the in vivo polyethylene wear of total hip arthroplasties in 14 young patients with UHMWPE liners at mean follow-up of 5 years using model-based radiostereometric analysis (RSA). A three-dimensional estimation of polyethylene wear (femoral head penetration into the liner) located the main portion of wear in the posterior-superior part of the liner. The measured clinical wear was correlated to structural stress and strain parameters in an extended FE model of the metal-on-UHMWPE bearing coupling. All structural parameters with the extended simulation model were located in the posterior-superior part of the liner and measures were within 1 standard deviation of the clinically measured RSA wear. Stain parameters gave the best correlation.

Keywords

Strain Energy Density Polyethylene Wear Polyethylene Liner Volumetric Wear Radiostereometric Analysis 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Abbreviations

2D

two-dimensional

3D

three-dimensional

CoCr

cobalt-chromium

DSS

directional shear stress

EGS models

elementary geometric shape models

E-poly

E-vitamin stabilized

FE

finite element

HCL

highly cross-linked

PE

polyethylene

RMSE

root mean square error

RSA

radiostereometric analysis

SD

standard deviation

SI

stress intensity

THA

total hip arthroplasty

UHMWPE

ultra high molecular weight polyethylene

VMS

Von Mises stress

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Copyright information

© Springer Berlin Heidelberg 2011

Authors and Affiliations

  1. 1.Department of OrthopaedicsHvidovre HospitalHvidovreDenmark
  2. 2.Orthopaedic Research UnitAarhus University HospitalAarhus CDenmark

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