374 Computational Modelling of Biomechanics and Biotribology
can reduce micromotion in the cup–bone interface, while decreasing bone
quality correlates with higher relative displacements.
In 2009, Zietz et al . (2009) published numerical and experimental cup x-
ation analyses of different cup designs. Their objective was to clarify the
in uence of the pro le of the cup on primary stability, in this case hemispher-
ical cups against conical designs. Biomechanical test blocks representing full
trabecular and combined cortical–trabecular bone were used. In numerical
simulation, the pull-out test was performed in a two-dimensional axisymmetric
model, while the lever-out test had to be modelled three-dimensionally due to
its asymmetric nature ...