A finite element study on the relationship between the vibrational behaviour of the hip stem-femur system and the contact area change at the implant-bone interface

Change of the contact distribution at the implant-femur interface influences the stiffness of the implantbone system and, as a consequence, is reflected by the evolution of the frequency response function. The influence of changing contact conditions on the resonance frequencies was however not yet quantitatively understood and therefore a finite element study was set up. In the first approach the hip stem was considered fully inserted and modal analyses were performed in various contact situations. In the second approach stem insertion was simulated and modal analyses were performed at different insertion stages. The results are in agreement with previous studies: contact increase causes positive resonance frequency shifts and the dynamic behaviour is most influenced by contact changes in the proximal zone. In addition, the same percentage of contact increase causes different resonance frequency shifts for different insertion stages. Depending on the amount of contact that is already established, shifts are larger or smaller. © 2008 by the Katholieke Universiteit Leuven Department of Mechanical Engineering All rights reserved.

ISBN:978-90-73802-86-5

Publication year:2008

BOF-keylabel:yes

IOF-keylabel:yes

Authors from:Higher Education