Silver Book Fact
About 315,000 Americans aged 45 and older were admitted to hospitals with hip fractures in 2001–a majority with osteoporosis as the underlying cause.
Kozak L, Owings M, Hall M. National Hospital Discharge Survey: 2001 annual summary with detailed diagnosis and procedure data. Vital Health Stat. 2004; 13(156): 1-198. http://www.ncbi.nlm.nih.gov/pubmed/15227812