Article

Serum 25-Hydroxyvitamin D and the Risk of Hip and Nonspine Fractures in Older Men

University of Pittsburgh, Department of Epidemiology, Pittsburgh, Pennsylvania 15261, USA.
Journal of bone and mineral research: the official journal of the American Society for Bone and Mineral Research (Impact Factor: 6.83). 09/2009; 25(3):545-53. DOI: 10.1359/jbmr.090826
Source: PubMed

ABSTRACT

The association between vitamin D levels and incident fractures in older men is uncertain. To test the hypothesis that low serum 25-hydroxyvitamin D [(25(OH)D] levels are associated with an increased risk of fracture, we performed a case-cohort study of 436 men with incident nonspine fractures, including 81 hip fractures, and a random subcohort of 1608 men; average follow-up time 5.3 years. Serum vitamin D(2) and vitamin D(3) were measured on baseline sera using mass spectrometry and summed for total vitamin D. Modified Cox proportional hazards models were used to estimate the hazard ratio (HR) of fracture with 95% confidence intervals (CIs). Multivariable models included age, clinic, season, race, height, weight, and physical activity. The mean (SD) total 25(OH)D was 24.6 (7.8) ng/mL in nonspine fracture subjects, 21.5 (7.9) ng/mL in hip fracture subjects, and 25.2 (7.8) ng/mL in controls (nonspine fracture subjects versus nonpatients, p = .14; hip fracture subjects versus controls, p < .0001). 25(OH)D levels were unrelated to nonspine fractures. One SD decrease in total 25(OH)D was associated with an increased risk of hip fracture (multivariate HR = 1.60; 95% CI 1.18-2.17). Compared with men in the top quartile of total 25(OH)D (> or =28), the HR of hip fracture was 2.36 (95% CI 1.08-5.15) for men in the lowest quartile (<20) (p = .009 for trend). Adjusting for hip bone mineral density attenuated the association by more than 50% (p = .065 for trend). Low serum 25(OH)D concentrations are associated with a higher risk of hip fracture in older men. Measurement of 25(OH)D may be useful in identifying men at high risk of hip fracture.

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    • "However, as our subjects hardly consumed enough calcium and none of them had sufficient level of serum vitamin D status, we could not test whether higher calcium intake and vitamin D level offer protection against bone resorption. There are quite a number of fairly large studies that found calcium and vitamin D provide no protective effect against fracture (Bischoff-Ferrari et al. 2007; Cauley et al. 2010; Cho et al. 2008; Lai et al. 2010). These conflicting results give rise to a need of more comprehensive studies to seek explanations for the association of calcium and vitamin D with bone resorption. "
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