Primary stability of uncemented femoral resurfacing implants for varying interface parameters and material formulations during walking and stair climbing

Journal of Biomechanics
Stephan RothstockMichael Morlock

Abstract

Primary stability of uncemented resurfacing prosthesis is provided by an interference fit between the undersized implant and the reamed bone. Dependent on the magnitude of interference, the implantation process causes high shear forces and large strains which can exceed the elastic limit of cancellous bone. Plastification of the bone causes reduced stiffness and could lead to bone damage and implant loosening. The purpose in this study was to determine press-fit conditions which allow implantation without excessive plastic bone deformation and sufficient primary stability to achieve bone ingrowth. In particular, the influence of interference, bone quality and friction on the micromotion during walking and stair-climbing was investigated. Therefore elastic and plastic finite element (FE) models of the proximal femur were developed. Implantation was realized by displacing the prosthesis onto the femur while monitoring the contact pressure, plastic bone deformation as well as implantation forces. Subsequently a physiologic gait and stair-climbing cycle was simulated calculating the micromotion at the bone-implant interface. Results indicate that plastic deformation starts at an interference of 30microm and the amount of plastified...Continue Reading

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Citations

Aug 1, 2015·Journal of Biomechanics·Niklas B DammNicholas E Bishop
Apr 5, 2017·Current Opinion in Rheumatology·Graeme Michael Campbell, Claus-C Glüer
Nov 1, 2011·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·Bidyut Pal, Sanjay Gupta

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