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Increased stability of short femoral stem through customized distribution of coefficient of friction in porous coating. | LitMetric

AI Article Synopsis

  • Stress shielding and aseptic loosening are problems with short stem total hip replacements that can lead to hardware failure.
  • The study explored optimizing the distribution of friction on a porous coating of a titanium alloy hip stem to reduce stress shielding in the proximal femur.
  • Results showed that certain distributions of lower and higher coefficients of friction in the stem's coating affect the biomechanical behavior of the femur and may help mitigate stress shielding.

Article Abstract

Stress shielding and aseptic loosening are complications of short stem total hip arthroplasty, which may lead to hardware failure. Stems with increased porosity toward the distal end were discovered to be effective in reducing stress shielding, however, there is a lack of research on optimized porous distribution in stem's coating. This study aimed to optimize the distribution of the coefficient of friction of a metaphyseal femoral stem, aiming for reducing stress shielding in the proximal area. A finite element analysis model of an implanted, titanium alloy short-tapered wedge stem featuring a porous coating made of titanium was designed to simulate a static structural analysis of the femoral stem's behavior under axial loading in Analysis System Mechanical Software. For computational feasibility, 500 combinations of coefficients of friction were randomly sampled. Increased strains in proximal femur were found in 8.4% of the models, which had decreased coefficients of friction in middle medial areas of porous coating and increased in lateral proximal and lateral and medial distal areas. This study reported the importance of the interface between bone and middle medial and distal lateral areas of the porous coating in influencing the biomechanical behavior of the proximal femur, and potentially reducing stress shielding.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11133419PMC
http://dx.doi.org/10.1038/s41598-024-63077-wDOI Listing

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