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Parametric Analysis of Cemented Ultrahigh Molecular Weight Polyethylene (UHMWPE) Total Hip Acetabular Cups in a Quasi-Static Loading Model

Published online by Cambridge University Press:  22 February 2011

Thomas Mittlmeier
Affiliation:
Chirurgische Klinik und Poliklinik der Universität München, Klinikum Grosshadern, Marchioninistr. 15, D-8000 Munchen 70, FRG Labor für Biomechanik und Experimentelle Orthopädie, Orthopädische Klinik und Poliklinik der Universität München, Staatliche Orthopädische Klinik München, Harlachingerstr. 51, D-8000 Munchen 90, FRG
W. Plitza
Affiliation:
Chirurgische Klinik und Poliklinik der Universität München, Klinikum Grosshadern, Marchioninistr. 15, D-8000 Munchen 70, FRG Labor für Biomechanik und Experimentelle Orthopädie, Orthopädische Klinik und Poliklinik der Universität München, Staatliche Orthopädische Klinik München, Harlachingerstr. 51, D-8000 Munchen 90, FRG
H. Schmotzer
Affiliation:
Chirurgische Klinik und Poliklinik der Universität München, Klinikum Grosshadern, Marchioninistr. 15, D-8000 Munchen 70, FRG Labor für Biomechanik und Experimentelle Orthopädie, Orthopädische Klinik und Poliklinik der Universität München, Staatliche Orthopädische Klinik München, Harlachingerstr. 51, D-8000 Munchen 90, FRG
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Abstract

Owing to the interest in ever increasing lifetimes for total hip prostheses, possible failure due to aseptic loosening of the acetabular component is an issue that may require increased attention. Mechanical factors, especially the deformation behavior of the material and the stress distribution at the implant-cement and the bone-cement interfaces, presumably play an essential role in total hip failure. Therefore the experimental model of the present work makes use of rosette strain gauge techniques to evaluate the deformation behavior of cemented polyethylene cups under quasi-static loading. Standard tests in UHMWPE beam specimens confirmed that the present method is a reliable tool for strain measurements in the polymer that was tested. On the other hand, the apparent elastic modulus of UHMWPE can be shown to be markedly dependent on the testing method, the geometry, and, owing to the visco-elastic properties, dependent on the strain rate. Thus in the present work a correlation between the measured strain and the ultimate strength was not attempted. Instead a parametric analysis quantifying the influence of the cup thickness and the cement distribution on the strain pattern was performed.

Type
Research Article
Copyright
Copyright © Materials Research Society 1986

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References

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Parametric Analysis of Cemented Ultrahigh Molecular Weight Polyethylene (UHMWPE) Total Hip Acetabular Cups in a Quasi-Static Loading Model
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Parametric Analysis of Cemented Ultrahigh Molecular Weight Polyethylene (UHMWPE) Total Hip Acetabular Cups in a Quasi-Static Loading Model
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