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Endocrine

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Association of subclinical thyroid dysfunction with bone mineral density and fracture: a meta-analysis of prospective cohort studies

  • Hongling Zhu
  • Jichen Zhang
  • Jingnan Wang
  • Xuemei Zhao
  • Mingjun GuEmail author
Original Article
First Online:
  • 32 Downloads

Abstract

Purpose

To comprehensively investigate the associations of subclinical thyroid dysfunction with BMD and fractures at various sites.

Methods

Comprehensive electronic and manual searches of databases were systematically conducted to identify prospective cohort studies from the inception of the databases to May 2019. The summary results for fractures and BMDs at various sites were calculated by relative risks (RRs) and weighted mean differences (WMDs) with corresponding 95% confidence intervals (CIs) using the random-effects model.

Results

Seventeen prospective cohorts from 24 studies were identified and 313,557 individuals were recruited in a final analysis. The summary RR indicated that subclinical hyperthyroidism was associated with an increased risk of any fracture (RR, 1.17; 95% CI, 1.08–1.26; P < 0.001), hip fracture (RR, 1.27; 95% CI, 1.09–1.48; P = 0.003), spine fracture (RR, 1.97; 95% CI, 1.31–2.97; P = 0.001), and non-spine fracture (RR, 1.19; 95% CI, 1.04–1.37; P = 0.014). However, there were no significant associations of subclinical hypothyroidism with the risk of any fractures (P = 0.166), hip fracture (P = 0.068), spine fracture (P = 0.818), and non-spine fracture (P = 0.277). Finally, subclinical hyperthyroidism was associated with lower distal forearm BMD in women, and ultradistal forearm BMD in both men and women, whereas subclinical hypothyroidism was associated with higher femur neck BMD in women.

Conclusion

Subclinical hyperthyroidism could induce additional risk on fractures at any, hip, spine, and non-spine, whereas subclinical hypothyroidism did not have any impact on fractures. Moreover, BMD at the lower distal and ultradistal forearms might be affected by subclinical hyperthyroidism, and higher femur neck BMD could be affected by subclinical hypothyroidism.

Keywords

Subclinical thyroid dysfunction Bone mineral density Fracture Meta-analysis 
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Notes

Acknowledgements

This work was supported by the fund of Pudong New Area Health System of Shanghai (grant numbers PWZzb2017-22, PWZxk2017-07).

Funding

This study was funded by Pudong New Area Health System of Shanghai (grant numbers PWZzb2017-22, PWZxk2017-07).

Author contributions

All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by H.Z., J.Z., J.W., and X.Z. The first draft of the manuscript was written by H.Z. and M.G., and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  • Hongling Zhu
    • 1
  • Jichen Zhang
    • 1
  • Jingnan Wang
    • 1
  • Xuemei Zhao
    • 1
  • Mingjun Gu
    • 1
    Email author
  1. 1.Department of Endocrinology, Shanghai Pudong New Area Gongli HospitalSecond Military Medical UniversityShanghaiChina

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