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3 April 2001 | Volume 134 Issue 7 | Pages 561-568
Background: Biochemical evidence of hyperthyroidism may be associated with low bone mass, particularly in older postmenopausal women, but no prospective studies of thyroid function and subsequent fracture risk have been done.
Objective: To examine the association between low levels of thyroid-stimulating hormone (TSH) and fracture in older women.
Design: Prospective cohort study with case-cohort sampling.
Setting: Four clinical centers in the United States.
Patients: 686 women older than 65 years of age from a cohort of 9704 women recruited from population-based listings between 1986 and 1988.
Measurements: Baseline assessment of calcaneal bone mass, spine radiography, and history of thyroid disease. Spine radiography was repeated after a mean follow-up of 3.7 years; nonspine fractures were centrally adjudicated. Thyroid-stimulating hormone was measured in sera obtained at baseline from 148 women with new hip fractures, 149 women with new vertebral fractures, and a subsample of 398 women randomly selected from the cohort.
Results: After adjustment for age, history of previous hyperthyroidism, self-rated health, and use of estrogen and thyroid hormone, women with a low TSH level (
Conclusions: Women older than 65 years of age who have low serum TSH levels, indicating physiologic hyperthyroidism, are at increased risk for new hip and vertebral fractures. Use of thyroid hormone itself does not increase risk for fracture if TSH levels are normal.
Author and Article Information
From University of California, San Francisco, San Francisco, California; University of Pittsburgh, Pittsburgh, Pennsylvania; University of Minnesota, Minneapolis, Minnesota; and Kaiser Permanente Medical Care Program, Oakland, California.
Grant Support: By Public Service Grant K08 AG00629 from the National Institute on Aging.
Requests for Single Reprints: Douglas C. Bauer, MD, University of California, San Francisco, 74 New Montgomery, Suite 600, San Francisco, CA 94105.
Current Author Addresses: Drs. Bauer, Nevitt, and Stone: University of California, San Francisco, 74 New Montgomery, Suite 600, San Francisco, CA 94105.
Dr. Ettinger: Division of Research, Kaiser Permanente, 3505 Broadway, 7th Floor, Oakland, CA 94611.
Author Contributions: Conception and design: D.C. Bauer.
Analysis and interpretation of the data: D.C. Bauer, B. Ettinger, M.C. Nevitt, K.L. Stone.
Drafting of the article: D.C. Bauer.
Critical revision of the article for important intellectual content: D.C. Bauer, B. Ettinger, M.C. Nevitt, K.L. Stone.
Final approval of the article: D.C. Bauer, B. Ettinger, M.C. Nevitt, K.L. Stone.
Statistical expertise: M.C. Nevitt, K.L. Stone.
Obtaining of funding: D.C. Bauer.
Administrative, technical, or logistic support: K.L. Stone. ARTICLE
Risk for Fracture in Women with Low Serum Levels of Thyroid-Stimulating Hormone
0.1 mU/L) had a threefold increased risk for hip fracture (relative hazard, 3.6 [95% CI, 1.0 to 12.9]) and a fourfold increased risk for vertebral fracture (odds ratio, 4.5 [CI, 1.3 to 15.6]) compared with women who had normal TSH levels (0.5 to 5.5 mU/L). After adjustment for TSH level, a history of hyperthyroidism was associated with a twofold increase in hip fracture (relative hazard, 2.2 [CI, 1.0 to 4.4]), but use of thyroid hormone itself was not associated with increased risk for hip fracture (relative hazard, 0.5 [CI, 0.2 to 1.3]).
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