Ved 36 måneder viste en analyse af rygsøjlerøntgenbilleder af 169 alendronatpatienter og 173 FORSTEOpatienter, at 13 patienter i alendronat- gruppen (7, 7%) havde oplevet en ny vertebral fraktur sammenlignet med 3 patienter i FORSTEO- gruppen (1, 7%) (p=0, 01).
At 36 months, analysis of spinal X-rays from 169 alendronate patients and 173 FORSTEO patients showed that 13 patients in the alendronate group (7.7%) had experienced a new vertebral fracture compared with 3 patients in the FORSTEO group (1.7%) (p=0.01).