Effect of Bisphosphonates on Fracture Outcomes Among Frail Older Adults.
J Am Geriatr Soc. 2018 Dec 21;:
Authors: Zullo AR, Zhang T, Lee Y, McConeghy KW, Daiello LA, Kiel DP, Mor V, Berry SD
BACKGROUND: Bisphosphonates are seldom used in frail, older adults, in part due to lack of direct evidence of efficacy in this population and increasing concerns about safety.
OBJECTIVE: We estimated the effects of bisphosphonates on hip fractures, nonvertebral fractures, and severe esophagitis among frail, older adults.
DESIGN: Population-based retrospective cohort using 2008 to 2013 linked national Minimum Data Set assessments; Online Survey Certification and Reporting System records; and Medicare claims.
SETTING: US nursing homes (NHs).
PARTICIPANTS: Long-stay NH residents 65 years and older without recent osteoporosis medication use (N = 24,571). Bisphosphonate initiators were 1:1 propensity score matched to calcitonin initiators (active comparator).
MEASUREMENTS: Hospitalized hip fracture, nonvertebral fracture, and esophagitis outcomes were measured using part A claims. Hazard ratios (HRs) and 95% confidence intervals (CIs) were estimated, controlling for over 100 baseline characteristics.
RESULTS: The matched cohort included 5209 new bisphosphonate users and an equal number of calcitonin users (mean age [SD] = 85  years; 87% female; 52% moderate-severe cognitive impairment). Over a mean follow-up of 2.5 (SD = 1.7) years, 568 residents (5.5%) had a hip fracture, 874 (8.4%) had a nonvertebral fracture, and 199 (1.9%) had a hospitalized esophagitis event. Users of bisphosphonates were less likely than calcitonin users to experience hip fracture (HR = 0.83; 95% CI = 0.71-0.98), with an average gain in time without fracture of 28.4 days (95% CI = 6.0-50.8 days). Bisphosphonate and calcitonin users had similar rates of nonvertebral fracture (HR = 0.91; 95% CI = 0.80-1.03) and esophagitis events (HR = 1.11; 95% CI = 0.84-1.47). The effects of bisphosphonates on fractures and esophagitis were generally homogeneous across subgroups, including those defined by age, sex, history of prior fracture, and baseline fracture risk.
CONCLUSIONS: Use of bisphosphonates is associated with a meaningful reduction in hip fracture among frail, older adults, but little difference in nonvertebral fracture or severe esophagitis.
PMID: 30575958 [PubMed - as supplied by publisher]