Cited by 42Thyroid Disorders and TreatmentsBone health and osteoporosis researchThyroid and Parathyroid Surgery

Bone mass, bone turnover and body composition in former hypothyroid patients receiving replacement therapy

Langdahl, Bente L, Loft, Anne Gitte R, Eriksen, Erik F, Mosekilde, Leif, Charles, Peder·1996·European Journal of Endocrinology

Abstract

Langdahl BL, Loft AGR, Eriksen EF, Mosekilde L, Charles P. Bone mass, bone turnover and body composition in former hypothyroid patients receiving replacement therapy. Eur J Endocrinol 1996;134:702–9. ISSN 0804–4643 The aim of the present cross-sectional study was to disclose whether long-term thyroxine replacement therapy (TRT) in primary hypothyroidism causes osteopenia. We compared 36 adult biochemically and clinically euthyroid patients who had received TRT for more than 5 years (mean 13 years) for primary hypothyroidism with 80 sex- and age-matched normal controls. Height, body weight and lean body mass were similar, but the patients had 21% higher fat body mass (p < 0.01) than their controls. Furthermore, compared to controls the patients had 29% higher serum thyroxine (T 4) and 31% higher serum free T 4 index (FT 4 I) levels (p < 0.001), whereas serum triiodothyronine (T 3) and FT 3 I levels were both reduced by 7% (p < 0.05). In the patients, serum TSH was reduced significantly (p < 0.001). No significant differences were observed between patients and normals in regional or total bone mineral content or bone mineral density levels, apart from 20% higher lumbar bone mineral content among the premenopausal patients (p < 0.05). Surprisingly, the mean serum calcium level was slightly elevated (2.38 ± 0.08 vs 2.33 ± 0.07 nmol/l, p < 0.001), serum phosphate decreased (1.13 ± 0.19 vs 1.23 ± 0.16 mmol/l, p < 0.01) and 24-h renal calcium excretion was reduced by 19% (p < 0.05). No changes were observed in serum magnesium, intact parathyroid hormone or calcitriol. The biochemical markers of bone resorption (serum carboxyterminal telopeptide of type I collagen, renal excretion of hydroxyproline, pyridinoline and deoxypyridinoline) and formation (serum levels of carboxyterminal propeptide of type I procollagen, osteocalcin and total and bone alkaline phosphatase) were similar in the two groups. We conclude that long-term thyroxine replacement therapy in primary hypothyroidism does not exert a negative effect on bone mass or alter bone turnover. Bente L Langdahl, University Department of Endocrinology and Metabolism, Aarhus Amtssygehus, Tage Hansensgade 2, DK-8000, Aarhus C, Denmark

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Crossref · 10.1530/eje.0.1340702

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  • None of the studies examining body weight and composition in LT4-treated subjects have shown significant differences in these parameters compared to control subjects or when LT4 doses were altered to lower TSH within the reference range.

    “None have shown significant differences in these parameters compared to control subjects (47,48) or when LT4 doses were altered to lower TSH within the reference range (14,41).”

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Authors
Langdahl, B. L., Loft, A. G. R., Eriksen, E. F., Mosekilde, L., & Charles, P.
Affiliations
Aarhus University (DK)
Corresponding author
Langdahl, Bente L
Venue
European Journal of Endocrinology
Published
1996-06
Volume
134
Issue
6
Pages
702-709
ISSN
  • 0804-4643 (ISSN-L)
  • 1479-683X
OpenAlex
W2146624680
Cited by
42
References
0
Citations by year
2026: 1 · 2025: 2 · 2024: 1 · 2023: 1 · 2022: 2 · 2020: 2 · 2019: 2 · 2018: 1 · 2015: 2 · 2014: 2 · 2013: 2 · 2012: 2
FWCI
1.07
Type
journal article
Language
en
Open access
closed
Locations
  • European Journal of Endocrinology (publishedVersion)
  • PubMed (publishedVersion)
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
primary hypothyroidism, thyroxine replacement, bone mineral density, bone turnover, osteopenia, body composition, fat mass, serum thyroid hormones, thyroid-stimulating hormone, serum calcium, serum phosphorus, urinary calcium excretion, bone resorption markers, bone formation markers
MeSH terms
Adult, Aged, Body Composition, Bone and Bones, Calcium, Female, Homeostasis, Humans, Hypothyroidism, Male, Middle Aged, Organ Size, Thyroid Gland, Thyroxine, Biomarkers, Bone Density

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