Abstract
Although muscle mass influences strength in older adults, it is unclear whether low lean mass measured by dual-energy X-ray absorptiometry (DXA) is an independent risk factor for hip fracture. Our objective was to determine the association between DXA lean mass and incident hip fracture risk among 1978 women aged 50 years and older participating in the Framingham Study Original and Offspring cohorts. Leg and total body lean mass (kg) were assessed from whole-body DXA scans collected in 1992–2001. Hip fracture follow-up extended from DXA assessment to the occurrence of fracture, death, drop-out, or end of follow-up in 2007. Cox proportional hazards regression was used to calculate hazard ratios (HR) and 95% confidence intervals (CI) estimating the relative risk of hip fracture associated with a 1-kg increase in baseline lean mass. Mean age was 66 years (range 50–93). Over a median of 8 years of follow-up, 99 hip fractures occurred. In models adjusted for age, height, study cohort, and percent total body fat, neither leg (HR 1.11; 95% CI 0.94, 1.31) nor total body (HR 1.06; 95% CI 0.99, 1.13) lean mass were associated with hip fracture. After further adjustment for femoral neck bone mineral density, leg lean mass results were similar (HR 1.10; 95% CI 0.93, 1.30). In contrast, 1 kg greater total body lean mass was associated with 9% higher hip fracture risk (HR 1.09; 95% CI 1.02, 1.18). Our findings suggest that in women, lower lean mass measured by DXA is not associated with increased risk of hip fracture.
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Acknowledgements
Research reported in this publication was supported by the National Institute of Arthritis and Musculoskeletal and Skin Diseases and the National Institute on Aging of the National Institutes of Health under award number R01AR/AG41398 and the National Heart, Lung and Blood Institute’s Framingham Heart Study (Contract No. HHSN268201500001I). The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.
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DPK is the guarantor. DPK, LAC, and MTH designed the study. RRM prepared the first draft of the paper. RRM, DPK, SDB, KEB, and MTH contributed to the data collection. RRM, KEB and XZ were responsible for statistical analysis of the data. All authors revised the paper critically for intellectual content and approved the final version. All authors agree to be accountable for the work and to ensure that any questions relating to the accuracy and integrity of the paper are investigated and properly resolved.
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Douglas P. Kiel has received grants from Eli Lilly, Amgen, Merck Sharp and Dohme, and has served on scientific advisory boards for Eli Lilly, Amgen, Novartis, and Merck Sharp and Dohme. Sarah D. Berry has received grant funding from Amgen. Robert R. McLean, Kerry E. Broe, Xiaochun Zhang, L. Adrienne Cupples, and Marian T. Hannan declare that they have no conflict of interest.
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This study was approved by the institutional review board at Hebrew SeniorLife and written informed consent was obtained for all participants included in the study.
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McLean, R.R., Kiel, D.P., Berry, S.D. et al. Lower Lean Mass Measured by Dual-Energy X-ray Absorptiometry (DXA) is Not Associated with Increased Risk of Hip Fracture in Women: The Framingham Osteoporosis Study. Calcif Tissue Int 103, 16–23 (2018). https://doi.org/10.1007/s00223-017-0384-y
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DOI: https://doi.org/10.1007/s00223-017-0384-y