Silver Book Fact
A prior vertebral fracture increases risk of another vertebral fracture by 5-fold for the year following.
Lindsay R, Silverman S, Cooper C, Hanley D, et al. Risk of New Vertebral Fracture in the Year Following a Fracture. JAMA. 2001; 285(3): 320-3. http://jama.ama-assn.org/cgi/content/abstract/285/3/320