Predictors of Hip Fracture Despite Treatment with Bisphosphonates among Frail Older Adults


OBJECTIVES

Bisphosphonates are effective at preventing hip fractures among older adults, yet many patients still fracture while on treatment and may benefit from additional preventive interventions. Little data are specifically available to target such efforts among bisphosphonate users. We aimed to identify predictors of hip fracture unique to frail older adults initiating pharmacologic treatment for osteoporosis.

DESIGN

Retrospective cohort using 2008‐2013 linked national Minimum Data Set assessments, Medicare claims, and nursing home (NH) facility data.

SETTING

NHs in the United States.

PARTICIPANTS

Long‐stay NH residents 65 years or older who initiated treatment with a bisphosphonate (N = 17 753). Estimates for bisphosphonate initiators were contrasted with those for calcitonin initiators (control group; N = 5348).

MEASUREMENTS

Hospitalized hip fracture outcomes were measured using Part A claims. Hazard ratios (HRs) and 95% confidence intervals (CIs) were estimated for 36 a priori selected potential predictors.

RESULTS

The mean (SD) age of the study population was 84 (8) years, 85% were women, and 51% had moderate to severe cognitive impairment. Predictors associated with a higher risk of hip fracture despite bisphosphonate use included age 75 years or older to 85 years (vs ≥65 to <75 y; HR = 1.25; 95% CI = 1.02‐1.55), female sex (HR = 1.33; 95% CI = 1.06‐1.67), white race (vs black race (HR = 1.87; 95% CI = 1.36‐2.58), and body mass index = 18.5‐24.9 (vs ≥30; HR = 1.93; 95% CI = 1.53‐2.42). Independent ability to transfer (vs total dependence; HR = 3.11; 95% CI = 1.83‐5.30) and occasional urinary incontinence (vs frequent; HR = 1.45; 95% CI = 1.18‐1.78) were also important predictors. Dementia, diabetes, psychoactive drug use, and other characteristics were not associated with post‐prescribing hip fracture. Predictors did not differ between bisphosphonate and calcitonin users.

CONCLUSION

Predictors of hip fracture among frail older adults did not differ between those who were new users of bisphosphonates vs calcitonin. Given the absence of risk factors unique to bisphosphonate users, targeting of fracture prevention efforts should extend beyond pharmacologic therapy to include existing nonpharmacologic therapies, particularly fall prevention strategies.

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