Cited by 85Thyroid Disorders and TreatmentsBone health and osteoporosis researchThyroid and Parathyroid Surgery

Subclinical Thyroid Dysfunction and the Risk for Fractures: A Systematic Review and Meta-analysis

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Wirth, Christina D., Blum, Manuel R., da Costa, Bruno R., Baumgartner, Christine, Collet, Tinh-Hai, Medici, Marco, Peeters, Robin P., Aujesky, Drahomir +2 more·2014·Annals of Internal Medicine

Abstract

BACKGROUND: Data on the association between subclinical thyroid dysfunction and fractures conflict. PURPOSE: To assess the risk for hip and nonspine fractures associated with subclinical thyroid dysfunction among prospective cohorts. DATA SOURCES: Search of MEDLINE and EMBASE (1946 to 16 March 2014) and reference lists of retrieved articles without language restriction. STUDY SELECTION: Two physicians screened and identified prospective cohorts that measured thyroid function and followed participants to assess fracture outcomes. DATA EXTRACTION: One reviewer extracted data using a standardized protocol, and another verified data. Both reviewers independently assessed methodological quality of the studies. DATA SYNTHESIS: The 7 population-based cohorts of heterogeneous quality included 50,245 participants with 1966 hip and 3281 nonspine fractures. In random-effects models that included the 5 higher-quality studies, the pooled adjusted hazard ratios (HRs) of participants with subclinical hyperthyroidism versus euthyrodism were 1.38 (95% CI, 0.92 to 2.07) for hip fractures and 1.20 (CI, 0.83 to 1.72) for nonspine fractures without statistical heterogeneity (P = 0.82 and 0.52, respectively; I2= 0%). Pooled estimates for the 7 cohorts were 1.26 (CI, 0.96 to 1.65) for hip fractures and 1.16 (CI, 0.95 to 1.42) for nonspine fractures. When thyroxine recipients were excluded, the HRs for participants with subclinical hyperthyroidism were 2.16 (CI, 0.87 to 5.37) for hip fractures and 1.43 (CI, 0.73 to 2.78) for nonspine fractures. For participants with subclinical hypothyroidism, HRs from higher-quality studies were 1.12 (CI, 0.83 to 1.51) for hip fractures and 1.04 (CI, 0.76 to 1.42) for nonspine fractures (P for heterogeneity = 0.69 and 0.88, respectively; I2 = 0%). LIMITATIONS: Selective reporting cannot be excluded. Adjustment for potential common confounders varied and was not adequately done across all studies. CONCLUSION: Subclinical hyperthyroidism might be associated with an increased risk for hip and nonspine fractures, but additional large, high-quality studies are needed. PRIMARY FUNDING SOURCE: Swiss National Science Foundation.

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  • In grade 1 SHyper, the HR for non-spine fractures was 1.15 (95% CI 0.75-1.77).

    “The HR was 1.46 (95% CI: 0.62-3.45)for hip fractures and 1.15 (95% CI: 0.75-1.77)for non-spine fractures in grade 1 SHyper and, respectively, 2.03 (95% CI: 0.27-15.00)and 1.97 (95% CI: 0.36-10.74)for grade 2 SHyper [108] .”

    From The 2015 European Thyroid Association Guidelines on Diagnosis and Treatment of Endogenous Subclinical Hyperthyroidism (2015) · cites this paper as [108]

    The Results section on subclinical hyperthyroidism and nonspine fractures reports an elevated, statistically nonsignificant risk, with a pooled HR of 1.20 (CI, 0.83 to 1.72) for the higher-quality studies. Our copy does not give the claimed grade 1 estimate of 1.15 (95% CI, 0.75–1.77), so it supports the general association but not that specific figure or grade. (LLM, conf=0.78)

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  • The pooled results of a meta-analysis of seven prospective cohort studies indicate that SHyper was associated with an increased risk for hip fractures and non-spine fractures.

    “The pooled results indicate that SHyper was associated with an increased risk for hip fractures and non-spine fractures [108] .”

    From The 2015 European Thyroid Association Guidelines on Diagnosis and Treatment of Endogenous Subclinical Hyperthyroidism (2015) · cites this paper as [108]

    The Results sections on hip and nonspine fractures report elevated pooled risk estimates for subclinical hyperthyroidism, and the Study Characteristics section identifies seven included cohorts. However, the confidence intervals for both fracture outcomes include no increased risk; the nonspine Results section explicitly says the increase was not statistically significant. The sentence presents the association more definitively than the pooled results warrant. (LLM, conf=0.86)

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  • In grade 1 SHyper, the HR for hip fractures was 1.46 (95% CI 0.62-3.45).

    “The HR was 1.46 (95% CI: 0.62-3.45)for hip fractures and 1.15 (95% CI: 0.75-1.77)for non-spine fractures in grade 1 SHyper and, respectively, 2.03 (95% CI: 0.27-15.00)and 1.97 (95% CI: 0.36-10.74)for grade 2 SHyper [108] .”

    From The 2015 European Thyroid Association Guidelines on Diagnosis and Treatment of Endogenous Subclinical Hyperthyroidism (2015) · cites this paper as [108]

    The Results section (Subclinical Hyperthyroidism and Hip Fractures; page unavailable) reports the exact HR and CI for studies using a TSH cutoff below 0.45 mIU/L. It does not identify that pooled estimate as specific to grade 1 SHyper; the Methods define subclinical hyperthyroidism as TSH below 0.45 mIU/L, which can also include lower TSH levels. (LLM, conf=0.86)

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  • Data from available prospective cohort studies suggest an increased risk of hip fractures and non-spine fractures in SHyper, with the risk of fractures being greater in adults with grade 2 SHyper.

    “Therefore, the data reported in the available prospective cohort studies suggest an increased risk of hip fractures and non-spine fractures in SHyper, with the risk of fractures being greater in adults with grade 2 SHyper [108, 109] .”

    From The 2015 European Thyroid Association Guidelines on Diagnosis and Treatment of Endogenous Subclinical Hyperthyroidism (2015) · cites this paper as [108]

    The Results sections on hip and nonspine fractures report higher estimated risks with subclinical hyperthyroidism, but neither pooled estimate is statistically significant. The hip-fracture estimate is higher in studies using a TSH cutoff of 0.1 mIU/L or less, with a very wide confidence interval; our copy does not establish a greater risk for grade 2 subclinical hyperthyroidism across both fracture types. (LLM, conf=0.84)

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  • These meta-analyses do not show evidence that treatment is effective in improving the risks associated with untreated SHyper.

    “Although these meta-analyses do not show evidence that treatment is effective in improving the risks associated with untreated SHyper, they demonstrate that SHyper is a potentially life-threatening condition.”

    From The 2015 European Thyroid Association Guidelines on Diagnosis and Treatment of Endogenous Subclinical Hyperthyroidism (2015) · cites this paper as [108]

    The Discussion (page unavailable) says no studies showed that treating subclinical hyperthyroidism reduced fracture risk, and calls for trials to assess treatment efficacy. This supports the claim for fracture risk, but the paper does not establish a lack of treatment evidence for the broader range of risks implied by the citing sentence; it also describes interventional evidence concerning bone mineral density. (LLM, conf=0.84)

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Research works printed but not linked: 1

  1. [28]BMJ Evidence Centre Study design search filters 2012 BMJ London Accessed at http://clinicalevidence.bmj.com/x/set/static/ebm/learn/665076.html on 28 May 2013

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Authors
Wirth, C. D., Blum, M. R., da Costa, B. R., Baumgartner, C., Collet, T.-H., Medici, M., Peeters, R. P., Aujesky, D., Bauer, D. C., & Rodondi, N.
Affiliations
  • University of Bern (CH)
  • From University of Bern, Bern, Switzerland; University Hospital of Lausanne, Lausanne, Switzerland; Erasmus Medical Center, Rotterdam, the Netherlands; and University of California, San Francisco, San Francisco, California.
Venue
Annals of Internal Medicine
Published
2014-08-05
Volume
161
Issue
3
Pages
189-199
ISSN
  • 0003-4819 (ISSN-L)
  • 1539-3704
OpenAlex
W1985689567
Cited by
85
References
102
Citations by year
2026: 4 · 2025: 3 · 2024: 1 · 2023: 5 · 2022: 7 · 2021: 8 · 2020: 11 · 2019: 7 · 2018: 10 · 2017: 7 · 2016: 7 · 2015: 13 · 2014: 2
FWCI
1.53
Type
journal article
Language
en
Open access
Locations
  • Annals of Internal Medicine (publishedVersion)
  • PubMed (publishedVersion)
  • EUR Research Repository (Erasmus University Rotterdam) (publishedVersion)
  • PubMed Central (acceptedVersion)
  • Archive ouverte UNIGE (University of Geneva) (acceptedVersion, other-oa)
  • IRIS (submittedVersion)
  • EUR Research Repository (Erasmus University Rotterdam) (submittedVersion)
  • Bern Open Repository and Information System (University of Bern) (submittedVersion)
  • eScholarship (California Digital Library) (submittedVersion)
  • SERVAL (Université de Lausanne) (submittedVersion, other-oa)
  • Archive ouverte UNIGE (University of Geneva) (submittedVersion, cc-by)
Funders
  • National Science Foundation
  • U.S. Department of Veterans Affairs
  • University of Pennsylvania
  • University of Minnesota
  • Norges Teknisk-Naturvitenskapelige Universitet
  • Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (138267, 145870, 320030)
  • Schweizerische Herzstiftung
  • Perelman School of Medicine, University of Pennsylvania
  • University of California, San Francisco
  • Geriatric Research Education and Clinical Center
  • National Institute of Arthritis and Musculoskeletal and Skin Diseases (K24AR051895)
  • NIH Clinical Center
Topics
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Thyroid Disorders and Treatments
  • Health Sciences › Medicine › Orthopedics and Sports Medicine › Bone health and osteoporosis research
  • Health Sciences › Medicine › Surgery › Thyroid and Parathyroid Surgery
Keywords
subclinical thyroid dysfunction, subclinical hyperthyroidism, subclinical hypothyroidism, hip fracture, fracture risk, thyroxine therapy, bone health, thyroid function
MeSH terms
Hip Fractures, Humans, Hyperthyroidism, Hypothyroidism, Thyroid Hormones, Fractures, Bone

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