I just read that the femur neck is 80% cortical, and the interior of that bone is trabecular, comprising 20%. I asked my doctor about whether Tymlos had a negative or zero effect on cortical bone (porosity), like Forteo, and was told that with Tymlos, the effect on this cortical bone was not a problem. It does improve the spine the most (trabecular) but Tymlos is okay for femur neck. Evenity might have a stronger positive effect on cortical bone in the femur neck (also in forearm). But ask your doctor!