Abstract
Summary
Research has not examined changes in bone mineral density (BMD) between men and women following hip fracture. The aim was to evaluate sex differences in BMD following hip fracture. Men experienced significant declines in BMD, while not statistically greater than women, underscoring the necessity for better osteoporosis care in men.
Introduction
Each year in the USA, approximately 260,000 older adults experience a hip fracture. Women experiencing hip fracture have excess decline in BMD in the year following fracture compared to expected decrements due to aging, but few studies have assessed sex differences in the sequelae of hip fracture. Thus, our objective was to examine sex differences in BMD change in the year after hip fracture.
Methods
The sample (n = 286) included persons enrolled in the Baltimore Hip Studies 7th cohort, a study that matched (1:1) men and women experiencing hip fracture. Weighted estimating equations that accounted for missing data and selective survival were used to estimate sex differences in 12-month total hip (TH) and femoral neck (FN) BMD changes.
Results
Men had larger average adjusted percent decline in TH and FN BMD. Adjusted 12-month decreases at the FN showed a statistically significant decline of −4.60 % (95 % confidence interval [CI] −7.76 %, −0.20 %) in men and an insignificant change of −1.62 % (95 % CI −4.57 %, 1.32 %) in women. Yet, the difference in change between men and women was not statistically significant (P = 0.17). The estimated sex differences for TH BMD loss were smaller in magnitude.
Conclusions
There is evidence of significant BMD loss among men at the FN in the year after hip fracture. Although not statistically greater than women, these clinically significant findings highlight the need for improved osteoporosis care among men prior to and after hip fracture.
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Acknowledgments
This research was supported by grants from the National Institute on Aging (R37 AG009901, R01 AG029315, P30 AG028747, T32 AG00262). We also acknowledge the cooperation of the hospitals, DXA facilities, residents, and families participating in this project.
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This observational research was conducted in accordance with the ethical standards of the Declaration of Helsinki, and the protocols for this study were reviewed and approved by the University of Maryland Institutional Review Board (IRB) and the review boards of participating hospitals.
Conflicts of interest
Dr. Jay Magaziner has consulting agreements with Ammonett, Novartis, Sanofi, and Viking. Dr. Denise Orwig has consulting agreements with Kinexum and Viking. Dr. Thomas Beck is CEO of Beck Radiological Innovations Inc. Drs. Alan M. Rathbun, Michelle Shardell, J. Richard Hebel, Gregory E. Hicks, and Marc C. Hochberg have no disclosures to declare.
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Rathbun, A.M., Shardell, M., Orwig, D. et al. Differences in the trajectory of bone mineral density change measured at the total hip and femoral neck between men and women following hip fracture. Arch Osteoporos 11, 9 (2016). https://doi.org/10.1007/s11657-016-0263-6
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DOI: https://doi.org/10.1007/s11657-016-0263-6