Computational modelling of cementless cup fixation in total hip arthroplasty (THA)

High primary stability is the basis for bony ingrowth and ongrowth, providing optimum secondary stability of cementless cups in total hip replacement. The numerical simulation of cup fixation assists to identify design parameters of press-fit cups with the aim to increase pull-out strength and lever-out torque and to decrease micromotion in the cup-bone interface. The substantial features of a finite-element-model describing cup fixation are description of material behavior, interaction properties, and formulation of friction. This chapter gives insight into details of calculating cup fixation by computational modelling of pull-out and lever-out from artificial bone blocks.