A new analysis showed that increases in bone mineral density (BMD) only accounted for 6 to 12 percent of the reduction in non-vertebral fracture risk that resulted from osteoporosis treatment over three years in postmenopausal women.
Previously, analyses of clinical trial data for three major osteoporosis therapies have shown that increases in BMD account for only a fraction (<1/3) of the total reduction in vertebral fracture risk. These new findings, presented today at ENDO 2003, the 85th annual meeting of The Endocrine Society, support that this is also the case for fractures at nonvertebral sites, such as the hip and wrist.
BMD measurement remains a good tool for evaluating patients who are not on treatment and for identifying patients on treatment who are not responding; however, BMD increases in response to therapy cannot replace fracture reduction as the ultimate goal of osteoporosis therapies and the most clinically relevant endpoint. Although BMD is often used as a surrogate marker of efficacy, this study provides further confirmation that BMD is only one of many factors that contribute to the efficacy of an osteoporosis therapy. "These results underscore the importance of physicians evaluating osteoporosis therapies based upon fracture reduction data," said Nelson B. Watts, MD, presenting author and Director, University of Cincinnati Bone Health and Osteoporosis Center. "Many factors of bone quality are important for strong bones, such as rate of bone turnover, bone microarchitecture, and material properties of bone. Therefore, BMD should not be used to compare fracture efficacy between osteoporosis therapies."
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