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• W2034453729 endingPage "1274" @default.
• W2034453729 startingPage "1261" @default.
• W2034453729 abstract "AbstractPredicting failure following the implantation of acetabular cups used in hip replacements is important in ensuring robust component designs. This study has developed 3D explicit dynamics finite element (FE) models to investigate the deformation of press-fit metal cups following insertion in the acetabular cavity. The cup deformation following insertion is clearly influenced by the forces encountered during insertion, the initial position of the cup in the cavity, the support provided by the underlying bone and the geometry of the cup itself. Experimentally validated explicit dynamics FE models were used to allow a physiologically relevant simulation of the impaction of cups, which is encountered in clinical practice, in comparison to previous studies that have used unrealistically high static forces to simulate a static press-fit insertion. Diametrical cup deformations were twice as large when the cup was tilted at 5° with respect to the cavity compared to when the poles of the cup and the cavity were aligned. The introduction of a non-uniform support to the cup increased deformations further by a factor of approximately 2.5. The greatest deformations established in the model were between 80 and 150 μm similar to typical cup–femoral head clearances. Increasing the thickness at the pole of the cup and reducing the cup diameter resulted in significantly smaller deformations being generated. These results suggest that small cup misalignments, which may not be noticeable in a clinical situation, may produce significant deformations after insertion especially when coupled with the non-uniform support found in the pelvis.Keywords:: acetabular cupship replacementfinite elementdeformationimpaction AcknowledgementsH.H. gratefully acknowledges the support of the School of Engineering and Materials Science, EPSRC Doctoral Training Account and DePuy International Ltd, Leeds, UK." @default.
• W2034453729 created "2016-06-24" @default.
• W2034453729 creator A5058466905 @default.
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• W2034453729 date "2012-12-14" @default.
• W2034453729 modified "2023-10-07" @default.
• W2034453729 title "Deformation of uncemented metal acetabular cups following impaction: experimental and finite element study" @default.
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• W2034453729 doi "https://doi.org/10.1080/10255842.2012.744397" @default.
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