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Advanced material modelling in numerical simulation of primary acetabular press-fit cup stability.

Authors
  • Souffrant, R
  • Zietz, C
  • Fritsche, A
  • Kluess, D
  • Mittelmeier, W
  • Bader, R
Type
Published Article
Journal
Computer Methods in Biomechanics & Biomedical Engineering
Publisher
Informa UK (Taylor & Francis)
Publication Date
Jan 01, 2012
Volume
15
Issue
8
Pages
787–793
Identifiers
DOI: 10.1080/10255842.2011.561012
PMID: 22817471
Source
Medline
License
Unknown

Abstract

Primary stability of artificial acetabular cups, used for total hip arthroplasty, is required for the subsequent osteointegration and good long-term clinical results of the implant. Although closed-cell polymer foams represent an adequate bone substitute in experimental studies investigating primary stability, correct numerical modelling of this material depends on the parameter selection. Material parameters necessary for crushable foam plasticity behaviour were originated from numerical simulations matched with experimental tests of the polymethacrylimide raw material. Experimental primary stability tests of acetabular press-fit cups consisting of static shell assembly with consecutively pull-out and lever-out testing were subsequently simulated using finite element analysis. Identified and optimised parameters allowed the accurate numerical reproduction of the raw material tests. Correlation between experimental tests and the numerical simulation of primary implant stability depended on the value of interference fit. However, the validated material model provides the opportunity for subsequent parametric numerical studies.

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