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A finite element analysis of the push-out test : influence of test conditions

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  • Physics

Abstract

A finite element analysis of the push-out test: Influence of test conditions W. J. A. Dhert:$ C.C. E M. VerheyenF't L. H. Braak: J. R. de Wijn: C. P. A.T. Klein; K. de Groot: and P. M. Rozingt *Biomaterials Research Group, Department of Biomaterials, School of Medicine, University of Leiden; 'Biomaterials Research Group, Department of Ortkopaedic Surgery, University Hospital Leiden; $Eindhoven University of Technology, Faculty of Mechanical Engineering, Eindhoven, The Netherlands The commonly used method for quantita- tive evaluation of the strength of a bone- implant interface is the push-out test. In order to give an impulse to standardiza- t ion and to ga in more insight in the biomechanics of the push-out test, a finite element analysis of this test was per- formed. This study focused on the influ- ence of test conditions on the push-out results. The influence of the following four parameters on the interface stress distribution was tested: (a) clearance of the hole in the support jig, (b) Young's modulus of the implant; (c) cortical thick- ness; and (d) implant diameter. The dis- tance between the implant and the support jig turned out to be very critical for the occurrence of peak stresses in the inter- face. Variations of the Young's modulus of the implants resulted in a wide range of interface shear stresses. Variation of the cortical thickness showed a reciprocal relationship between cortical thickness and interface shear stress. However, the interface stress distribution remained uniform under the specific test circum- stances. These findings also hold for vari- ations in implant diameter. The present investigation shows that the clearance of the hole in the support jig, and the Young's modulus of the implant are parameters which most strongly influence the inter- face stress distribution. The clearance of the hole in the support jig is the most criti- cal parameter, but also the parameter that can be control led most easily. Lac

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