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Long-term thyroxine treatment and bone mineral density.
J A Franklyn1, J Betteridge, J Daykin
1Department of Medicine, University of Birmingham, UK.
Lancet (London, England)
|July 4, 1992
Summary
Long-term thyroxine replacement therapy did not impact bone mineral density in differentiated thyroid cancer patients. This study suggests thyroxine alone does not increase the risk of osteoporotic fractures.
Area of Science:
- Endocrinology
- Bone Metabolism
- Thyroid Disorders
Background:
- Conflicting results exist regarding thyroxine replacement therapy's effect on bone mineral density.
- Some studies suggest reduced bone mass, prompting dose reduction recommendations.
Purpose of the Study:
- To investigate the long-term effects of thyroxine therapy on bone mineral density.
- To determine if thyroxine treatment influences the risk of osteoporotic fractures.
Main Methods:
- A cohort of 49 patients post-thyroidectomy for differentiated thyroid cancer received long-term thyroxine therapy.
- Patients were matched with controls based on age, sex, BMI, and lifestyle factors.
- Bone mineral density was measured using dual-energy X-ray absorptiometry at multiple skeletal sites.
Main Results:
- No significant difference in bone mineral density was observed between patients on long-term thyroxine therapy and controls.
- Bone mineral density did not correlate with thyroxine dose, treatment duration, or thyroid function tests.
- Both groups showed age-related bone density decline.
Conclusions:
- Thyroxine replacement therapy, in the context of differentiated thyroid cancer treatment, does not appear to negatively affect bone mineral density.
- Thyroxine alone is unlikely to be a significant risk factor for osteoporotic fractures.
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