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You are here: Home / Articles / Osteoporosis Experts Discuss Bisphosphonates, Chronic Kidney Disease

Osteoporosis Experts Discuss Bisphosphonates, Chronic Kidney Disease

March 19, 2019 • By Lara C. Pullen, PhD

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Javier Regueiro / shutterstock.com

Javier Regueiro / shutterstock.com

CHICAGO—The osteoporosis session at the 2018 ACR/ARHP Annual Meeting opened with a discussion by Kenneth Saag, MD, MSc, professor of medicine at the University of Alabama, Birmingham, in which he highlighted adverse events associated with osteoporosis medications.

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Dr. Saag began his presentation by emphasizing that, above all, the audience should keep in mind that the biggest crisis in osteoporosis is the decline in treatment for both the primary and secondary prevention of osteoporosis. He reminded the audience to place his talk in this context and recognize that all drugs have potential adverse effects.

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Bisphosphonates Risk

Healthcare providers prescribe many different drugs to treat osteoporosis, and although Dr. Saag touched on all of them, he spent most of his time focusing on bisphos­phonates, answering the question, “Is it bad for the bone and other tissues?” He emphasized the benefits of bisphosphonate treatment are clear and described them as the “gift that never stops giving,” noting that if a patient stops taking alendronate after a 10-year period, the drug continues to persist in the bone. That persistence means the patient continues to receive the bioequivalence of approximately 25% of the daily dose.

Unfortunately, some patients who take bisphosphonates may also experience osteonecrosis of the jaw (ONJ), which presents as an area of exposed and/or necrotic bone in the maxillofacial region. This very rare side effect can prove quite serious, especially if the patient experiences an even less common pathologic jaw fracture. Dr. Saag explained it may be possible to prevent ONJ prior to anti-resorptive therapy by treating oral infection with antibiotics. He also noted the importance of ensuring patients realize that if they plan to have dental work done, that work should be healed prior to when they start anti-resorptive therapy.

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Bisphosphonates can also cause atypical femur fractures (AFF), which form along the femoral diaphysis from lesser trochanter to supracondylar. Such fractures are sometimes described as the dreaded black line. The risk of an AFF among bisphosphonate users is estimated to be eight in 10,000. Additional possible side effects, such as esophageal and gastric cancer, have some biologic rationale, Dr. Saag explained, and are less well understood and even less likely to be causally related to bisphosphonate use.

Give Them a Break

Given the clear but rare adverse events associated with bisphosphonate use, a physician must determine for each patient if the known benefits outweigh the potential risks. Dr. Saag suggested that to manage the risk-benefit ratio, rheumatologists should query patients for signs of AFF via patient history and physical examination. This is best performed by focusing on new hip or thigh pain. Patients with thigh pain associated with a stress reaction or incomplete AFF may require prophylactic surgery and rodding. They may also need to take a break from bisphosphonates. Dr. Saag explained noted that, “We may want to rest and reenergize and consider switching to something different after that period of time.” Such a break may be as short as one year.

The American Society for Bone and Mineral Research (ASBMR) has put forward an algorithmic approach to taking such a break from bisphosphonates. Analyses of U.S. Medicare data, as well as other large datasets, indicate the risk of AFFs decline after a drug holiday of one year. This is encouraging, especially because AFF and ONJ are the adverse events most certainly associated with bisphosphonates.

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Dr. Saag concluded his presentation by stating the use of osteoporosis drugs requires careful and recurrent assessment of fracture benefits and adverse event risks. As part of that assessment, he encouraged the audience to seriously consider the possibility that patients on bisphosphonates should receive a drug holiday or switch to another treatment.

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Filed Under: Conditions, Meeting Reports Tagged With: 2018 ACR/ARHP Annual Meeting, Association of Rheumatology Professionals (ARP), Bisphosphonate, chronic kidney disease, OsteoporosisIssue: March 2019

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