  Continuum bone remodelling is an important tool for predicting the effects of
mechanical stimuli on bone density evolution. While the modelling of only
cancellous bone is considered in many studies based on continuum bone
remodelling, this work presents an approach of modelling also cortical bone and
the interaction of both bone types. The distinction between bone types is made
by introducing an initial volume fraction. A simple point-wise example is used
to study the behaviour of novel model options, as well as a proximal femur
example, where the interaction of both bone types is demonstrated using initial
density distributions. The results of the proposed model options indicate that
the consideration of cortical bone remarkably changes the density evolution of
cancellous bone, and should therefore not be neglected.
