PMID: 9529932Apr 8, 1998Paper

Analysis of contact mechanics for composite cushion knee joint replacements

Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
T StewartJ Fisher

Abstract

Recent research in the area of cushion form bearings for total joint replacements has primarily used thin, soft, elastomeric layers with similar elastic modulus to articular cartilage, bonded to rigid substrates. These are designed to promote the body's natural lubricants to separate the articulating surfaces and prevent wear. Applications to joint replacements have revealed that the abrupt change in stiffness between the soft layer and the rigid substrate and the relatively low strength of the interface resulted in high shear stresses and debonding of the soft layer from the substrate. The approach adopted in this study is to use components with a graded modulus or composite construction. The composite construction consists of a soft compliant layer of polyurethane and a second stiffer polyurethane layer thought to be rigid enough to mechanically interlock to a metallic tibial tray. In this composite structure the deformation of the more rigid polyurethane underlay may generally influence the stress distribution and deformation in the softer upper layer and at the interface between the two materials. A simple analysis technique is presented in the present study where the composite double layer was approximated as an equivalent...Continue Reading

References

Jan 1, 1991·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·Z M JinJ Fisher
Jan 1, 1991·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·D DowsonB Jobbins
Jan 1, 1990·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·S O'CarrollB Jobbins
Jan 1, 1995·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·D D AugerJ Fisher
Jan 1, 1995·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·D D AugerJ Fisher
Jan 1, 1995·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·Z M JinJ Fisher
Jan 1, 1995·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·Z M JinJ Fisher
Jan 1, 1993·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·D D AugerZ M Jin
Jan 1, 1995·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·T StewartJ Fisher

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Citations

Jun 17, 2003·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·S S VirdeeZ M Jin
Sep 2, 2008·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·N Nic An Ghaill, E G Little
Dec 5, 2002·Journal of Biomaterials Science. Polymer Edition·Mao WangJudy Wood
Mar 7, 2014·Journal of Biomedical Materials Research. Part B, Applied Biomaterials·Kenneth R St John

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