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. 2007 May 16:2:7.
doi: 10.1186/1749-799X-2-7.

Experimental and analytical validation of a modular acetabular prosthesis in total hip arthroplasty

Francisco Romero  1 , Farid Amirouche, Luke Aram, Mark H Gonzalez
Affiliations

Experimental and analytical validation of a modular acetabular prosthesis in total hip arthroplasty

Francisco Romero et al. J Orthop Surg Res. .

Abstract

A finite element model has been developed to predict in vivo micro motion between a modular acetabular cup and liner after cement less total hip arthroplasty. The purpose of this study is to experimentally validate the model. Six LVDT sensors were used to monitor the micromotion of the liner when subjected to loading conditions ranging from 250 N to 5000 N. Deformations at points of interest for both the experiment and FEM were compared. Results of the FEM with different coefficient of friction between the liner and the cup were investigated to correlate with the experimental results.

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Figures

Figure 1
Figure 1
Experiment set-up. Orientation of the acetabular components (acetabular shell, liner and femoral head) with respect to applied load.
Figure 2
Figure 2
Modular Acetabular components set-up and LVDT sensors' positioning.
Figure 3
Figure 3
Finite Element Model of the acetabular shell, liner and femoral head. The liner locking mechanism was simulated constraining all degrees of freedom of the nodes located at the same positions as locking tabs of the real-life liner.
Figure 4
Figure 4
Contacting areas (Acetabular Shell/liner and Liner/femoral head) involved in the Finite Element Model.
Figure 5
Figure 5
Coordinate system used as a reference for the loads in the FE model. The CS is shown with respect to the acetabular shell inclination angle.
Figure 6
Figure 6
Maximum micromotions achieved for each of the seven liner specimen analyzed.
Figure 7
Figure 7
Maximum and minimum micromotions values, among all the specimens analyzed, recorded for each sensor. Comparison with the results obtained with the FE model considering two different friction coefficients.
Figure 8
Figure 8
Maximum and minimum micromotions values, among all the specimens analyzed, recorded for each sensor. Comparison with the results obtained with the FE model considering two different friction coefficients.
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