PMID: 9529936Apr 8, 1998Paper

Prediction of plastic strains in ultra-high molecular weight polyethylene due to microscopic asperity interactions during sliding wear

Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
C McNieJ Fisher

Abstract

Studies of explanted femoral heads have shown that scratches caused by bone cement, bone or metallic particles are present on the rubbing surface. This damage has been cited as a cause of increased wear of ultra-high molecular weight polyethylene (UHMWPE) acetabular cups and it is known that the particulate wear debris produced leads to osteolysis. A series of explanted Charnley femoral heads have been surface characterized using a Talysurf 6 profilometer and found to have scratches with lip heights in the size range 0.1-3.25 microns with an average height of 1 micron giving an average aspect ratio (defined as height/half-width) of 0.1. These geometries were incorporated into a finite element model of a stainless steel asperity sliding over UHMWPE under conditions similar to those in an artificial hip system. It was found that as the aspect ratio of the asperity lip increased, the plastic strains both on and below the surface of the UHMWPE increased non-linearly, but that the magnitude of the strain was independent of the asperity height. The asperity aspect ratio was also found to affect the position of the maximum sub-surface strain, as the asperity aspect ratio was increased the maximum strain rose to the surface. The high p...Continue Reading

References

Jan 1, 1990·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·L CaraviaB Jobbins
Nov 1, 1984·Journal of Biomedical Materials Research·P Eyerer, Y C Ke
Jan 1, 1995·Journal of Biomedical Materials Research·P CampbellH C Amstutz
Jan 1, 1996·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·J L HaileyJ Fisher
Jan 1, 1995·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·J FisherG H Isaac

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Citations

Mar 23, 2002·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·P I BarnettJ Fisher
Jul 21, 2004·Journal of Biomedical Materials Research. Part B, Applied Biomaterials·Warren MacdonaldAnn Wennerberg
Oct 30, 2004·Computer Methods in Biomechanics and Biomedical Engineering·Haimad BaudrillerFrédéric Dubois
Sep 21, 2004·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·C H ChoY Iwamoto
Jan 12, 2013·Computer Methods in Biomechanics and Biomedical Engineering·Karen M KrugerThomas D Brown
Aug 31, 1999·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·Z M JinD D Auger
Dec 3, 2008·Journal of Biomechanical Engineering·Matthew C PaulThomas D Brown
Jul 25, 2006·Journal of Biomedical Materials Research. Part B, Applied Biomaterials·H BaudrillerD Moukoko
Oct 5, 2006·Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society·Hannah J LundbergThomas D Brown

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