RT Book, Section A1 Oppelt, Thomas F. A2 Sutton, S. Scott SR Print(0) ID 7254238 T1 Chapter 46. Osteoporosis T2 McGraw-Hill's NAPLEX® Review Guide YR 2011 FD 2011 PB The McGraw-Hill Companies PP New York, NY SN 978-0-07-175562-7 LK accesspharmacy.mhmedical.com/content.aspx?aid=7254238 RD 2024/04/19 AB Osteoporosis is a disease of the skeleton marked by low bone mass and microarchitectural degeneration of bone tissue, with a subsequent increase in fracture risk.1,2 In the United States, 10 million people are estimated to have osteoporosis and almost 34 million more are believed to have osteopenia (low bone mass), placing them at risk of developing osteoporosis.3 Studies suggest that over 2 million osteoporosis-related fractures occur in the United States annually, with an estimated cost of $17 billion.4,5 Some speculate that the prevalence of these bone metabolism disorders may be on the rise, in part, due to a decrease in the overall routine utilization of hormone replacement therapy (HRT) for most postmenopausal women. In 2002, the Women's Health Initiative (WHI) was published suggesting that the risks of long-term estrogen plus progestin supplementation outweighed any benefits (namely, the FDA-approved prevention of osteoporosis).5 Also, while osteoporosis is less prevalent in men than women, men account for almost 30% of low bone mass related (fragility) fractures.4