Subclinical thyroid dysfunction, bone mineral density, and osteoporosis in a middle-aged Korean population

Abstract

Summary

Thyroid dysfunction is associated with the loss of bone density (osteoporosis). However, the connection between subclinical thyroid dysfunction and osteoporosis remains controversial. This study found no apparent association between subclinical hypothyroidism or subclinical hyperthyroidism and bone mineral density (BMD) in the lumbar spine and femur.

Introduction

The present study examined the relationship between subclinical thyroid dysfunction and BMD in healthy middle-aged adults.

Methods

A total of 25,510 healthy Koreans with normal free thyroxine levels were enrolled from January 2011 to December 2016, and 91% of subjects visited only once. The average age of the 15,761 women was 45, and the average age of the 9749 men was 48. Levels of thyroid-stimulating hormone (TSH) and BMD were recorded in all subjects. BMD was measured using dual-energy X-ray absorptiometry.

Results

No apparent association was found between subclinical thyroid dysfunction and BMD in the lumbar spine, femur-neck, and proximal femur sites compared with a euthyroid group. Age, body mass index (BMI), and postmenopausal status affected BMD in women, and only BMI affected BMD in men. Subclinical hypothyroidism was independently associated with a lower risk of osteoporosis (odds ratio 0.657, 95% confidence interval 0.464–0.930) in 4710 postmenopausal women.

Conclusions

No apparent association was found between subclinical hypothyroidism or subclinical hyperthyroidism defined on single TSH measurement and BMD at the lumbar spine and femur in a large cohort of middle-aged men and women. Subclinical hypothyroidism was independently associated with a lower risk of osteoporosis in postmenopausal women.

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Acknowledgments

We would like to thank the staff of the Kangbuk Samsung Cohort Study for their hard work, dedication and continuing support.

Funding

This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (No. 2017R1D1A1B03036425).

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Correspondence to M.J. Kwon.

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Lee, K., Lim, S., Park, H. et al. Subclinical thyroid dysfunction, bone mineral density, and osteoporosis in a middle-aged Korean population. Osteoporos Int 31, 547–555 (2020). https://doi.org/10.1007/s00198-019-05205-1

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Keywords

  • Subclinical thyroid dysfunction
  • Bone mineral density
  • Osteoporosis