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

Area of Science:

• Endocrinology
• Bone Metabolism
• Geriatric Medicine

Background:

• Thyroid dysfunction is a known risk factor for osteoporosis.
• The association between subclinical thyroid dysfunction and bone mineral density (BMD) remains debated.
• This study investigates the relationship in healthy middle-aged adults.

Purpose of the Study:

• To examine the link between subclinical thyroid dysfunction and BMD in healthy middle-aged individuals.
• To determine if subclinical hypothyroidism or hyperthyroidism affects bone density.
• To identify factors influencing BMD in men and women.

Main Methods:

• A cohort of 25,510 healthy Koreans with normal free thyroxine levels was studied.
• Thyroid-stimulating hormone (TSH) and BMD were measured using dual-energy X-ray absorptiometry.
• Data were collected between January 2011 and December 2016.

Main Results:

• No significant association was found between subclinical thyroid dysfunction and BMD at the lumbar spine or femur.
• Age, BMI, and menopausal status influenced BMD in women; BMI influenced BMD in men.
• Subclinical hypothyroidism was linked to a reduced osteoporosis risk in postmenopausal women.

Conclusions:

• Subclinical thyroid dysfunction, based on a single TSH measurement, does not show an apparent association with BMD in the spine and femur.
• Subclinical hypothyroidism may be associated with a lower risk of osteoporosis specifically in postmenopausal women.