Silver Book Fact
Two or more vertebral fractures increase risk of a subsequent vertebral fracture by 12-fold.
Ross P, Davis J, Epstein R, Wasnich R. Pre-Existing Fractures and Bone Mass Predict Vertebral Fracture Incidence in Women. Ann Intern Med. 1991; 114(11): 919-23. http://annals.org/aim/article-abstract/704696/pre-existing-fractures-bone-mass-predict-vertebral-fracture-incidence-women?volume=114&issue=11&page=919