Prospective Study of Diabetes and Risk of Hip Fracture

The Nurses’ Health Study

  1. Mohsen Janghorbani, PHD13,
  2. Diane Feskanich, SCD2,
  3. Walter C. Willett, MD23 and
  4. Frank Hu, MD23
  1. 1School of Public Health, Isfahan University of Medical Sciences, Isfahan, Iran
  2. 2Channing Laboratory, Brigham and Women’s Hospital and Harvard Medical School, Boston, Massachusetts
  3. 3Department of Nutrition, Harvard School of Public Heath, Boston, Massachusetts
  1. Address correspondence and reprint requests to Prof. M. Janghorbani, School of Public Health, Isfahan University of Medical Sciences, Isfahan, Iran. E-mail: janghorbani{at}yahoo.com

Abstract

OBJECTIVE—The purpose of this study was to determine whether women with type 1 and type 2 diabetes are at higher risk of hip fractures.

RESEARCH DESIGN AND METHODS—A total of 109,983 women aged 34–59 years in 1980 were followed through 2002 for the occurrence of hip fracture. At baseline and through biennial follow-up, women were asked about their history and treatment of diabetes and other potential risk factors for hip fracture.

RESULTS—During 2.22 million person-years of follow-up, 1,398 women had a hip fracture. Compared with women without diabetes, the age-adjusted relative risk (RRs) of hip fracture was 7.1 (95% CI 4.4–11.4) for women with type 1 diabetes and 1.7 (1.4–2.0) for those with type 2 diabetes. After further adjustment for BMI, smoking, physical activity, menopausal status, daily intake of calcium, vitamin D, protein, and postmenopausal hormone use, the multivariate RR of incident hip fracture in individuals with type 1 diabetes compared with individuals without diabetes was 6.4 (3.9–10.3) and with type 2 diabetes was 2.2 (1.8–2.7). The RRs increased with longer duration of type 2 diabetes (3.1 [2.3–4.0] for ≥12 years compared with no diabetes, P for trend < 0.001) and ever use of insulin.

CONCLUSIONS—These data indicate that both type 1 and type 2 diabetes are associated with an increased risk of hip fracture. The results of this study highlight the need for fracture-prevention strategies in women with diabetes.

Footnotes

  • The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked “advertisement” in accordance with 18 U.S.C Section 1734 solely to indicate this fact.

    A table elsewhere in this issue shows conventional and Système International (SI) units and conversion factors for many substances.

    • Accepted April 18, 2006.
    • Received February 24, 2006.
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