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JAMA. 2015 May 26;313(20):2055-65. doi: 10.1001/jama.2015.5161.

Subclinical thyroid dysfunction and fracture risk: a meta-analysis.

Author information

1
Department of General Internal Medicine, Inselspital, Bern University Hospital, Bern, Switzerland.
2
Departments of Medicine and Epidemiology and Biostatistics, University of California, San Francisco.
3
Service of Endocrinology, Diabetes and Metabolism, University Hospital of Lausanne, Lausanne, Switzerland.
4
Department of Medicine, University of Minnesota School of Medicine, Minneapolis5Geriatric Research Education and Clinical Center, VA Medical Center, Minneapolis, Minnesota.
5
University of Pennsylvania School of Medicine, Philadelphia7Associate Editor, JAMA.
6
Department of Physical Therapy, Nicole Wertheim College of Nursing and Health Science, Florida International University, Miami.
7
Department of Internal Medicine, Erasmus Medical Center, Rotterdam, the Netherlands10Department of Epidemiology, Erasmus Medical Center, Rotterdam, the Netherlands.
8
Department of Public Health and General Practice, Norwegian University of Science and Technology, Trondheim, Norway12Department of Endocrinology, St Olavs Hospital, Trondheim University Hospital, Trondheim, Norway.
9
Department of Public Health and Primary Care, Leiden University Medical Center, Leiden, the Netherlands.
10
Department of Public Health and Primary Care, University of Cambridge, Cambridge, United Kingdom.
11
Radiation Effects Research Foundation, Nagasaki, Japan.
12
School of Population Health, University of Western Australia, Crawley, WA, Australia.
13
Department of Medicine, Imperial College London, London, United Kingdom.
14
Department of Human Metabolism, University of Sheffield, Sheffield, United Kingdom.
15
Department of Epidemiology and Public Health, University College Cork, Cork, Ireland.
16
Department of Epidemiology, University of Pittsburgh, Pittsburgh, Pennsylvania.
17
Cardiovascular Health Research Unit, University of Washington, Seattle.
18
Department of Public Health and General Practice, Norwegian University of Science and Technology, Trondheim, Norway22Levanger Hospital, Nord-Trøndelag Hospital Trust, Levanger, Norway.
19
Department of Clinical and Experimental Medicine, Geriatric Endocrine Unit, University Hospital of Parma, Parma, Italy.
20
Institute of Cardiovascular and Medical Sciences, University of Glasgow, United Kingdom.
21
Department of Public Health, University of Copenhagen, Copenhagen, Denmark.
22
Department of Public Health and General Practice, Norwegian University of Science and Technology, Trondheim, Norway.
23
National Institute on Aging, National Institutes of Health, Baltimore, Maryland.
24
School of Medicine and Pharmacology, University of Western Australia, Crawley, WA, Australia28Department of Endocrinology and Diabetes, Sir Charles Gairdner Hospital, Nedlands, WA, Australia.
25
Institute of Social and Preventive Medicine, University of Bern, Bern, Switzerland.

Abstract

IMPORTANCE:

Associations between subclinical thyroid dysfunction and fractures are unclear and clinical trials are lacking.

OBJECTIVE:

To assess the association of subclinical thyroid dysfunction with hip, nonspine, spine, or any fractures.

DATA SOURCES AND STUDY SELECTION:

The databases of MEDLINE and EMBASE (inception to March 26, 2015) were searched without language restrictions for prospective cohort studies with thyroid function data and subsequent fractures.

DATA EXTRACTION:

Individual participant data were obtained from 13 prospective cohorts in the United States, Europe, Australia, and Japan. Levels of thyroid function were defined as euthyroidism (thyroid-stimulating hormone [TSH], 0.45-4.49 mIU/L), subclinical hyperthyroidism (TSH <0.45 mIU/L), and subclinical hypothyroidism (TSH ≥4.50-19.99 mIU/L) with normal thyroxine concentrations.

MAIN OUTCOME AND MEASURES:

The primary outcome was hip fracture. Any fractures, nonspine fractures, and clinical spine fractures were secondary outcomes.

RESULTS:

Among 70,298 participants, 4092 (5.8%) had subclinical hypothyroidism and 2219 (3.2%) had subclinical hyperthyroidism. During 762,401 person-years of follow-up, hip fracture occurred in 2975 participants (4.6%; 12 studies), any fracture in 2528 participants (9.0%; 8 studies), nonspine fracture in 2018 participants (8.4%; 8 studies), and spine fracture in 296 participants (1.3%; 6 studies). In age- and sex-adjusted analyses, the hazard ratio (HR) for subclinical hyperthyroidism vs euthyroidism was 1.36 for hip fracture (95% CI, 1.13-1.64; 146 events in 2082 participants vs 2534 in 56,471); for any fracture, HR was 1.28 (95% CI, 1.06-1.53; 121 events in 888 participants vs 2203 in 25,901); for nonspine fracture, HR was 1.16 (95% CI, 0.95-1.41; 107 events in 946 participants vs 1745 in 21,722); and for spine fracture, HR was 1.51 (95% CI, 0.93-2.45; 17 events in 732 participants vs 255 in 20,328). Lower TSH was associated with higher fracture rates: for TSH of less than 0.10 mIU/L, HR was 1.61 for hip fracture (95% CI, 1.21-2.15; 47 events in 510 participants); for any fracture, HR was 1.98 (95% CI, 1.41-2.78; 44 events in 212 participants); for nonspine fracture, HR was 1.61 (95% CI, 0.96-2.71; 32 events in 185 participants); and for spine fracture, HR was 3.57 (95% CI, 1.88-6.78; 8 events in 162 participants). Risks were similar after adjustment for other fracture risk factors. Endogenous subclinical hyperthyroidism (excluding thyroid medication users) was associated with HRs of 1.52 (95% CI, 1.19-1.93) for hip fracture, 1.42 (95% CI, 1.16-1.74) for any fracture, and 1.74 (95% CI, 1.01-2.99) for spine fracture. No association was found between subclinical hypothyroidism and fracture risk.

CONCLUSIONS AND RELEVANCE:

Subclinical hyperthyroidism was associated with an increased risk of hip and other fractures, particularly among those with TSH levels of less than 0.10 mIU/L and those with endogenous subclinical hyperthyroidism. Further study is needed to determine whether treating subclinical hyperthyroidism can prevent fractures.

PMID:
26010634
PMCID:
PMC4729304
DOI:
10.1001/jama.2015.5161
[Indexed for MEDLINE]
Free PMC Article

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