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Trabecular bone remodeling and bone balance in hyperthyroidism.

E F Eriksen, L Mosekilde, F Melsen

    Bone
    |January 1, 1985
    PubMed
    Summary
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    Hyperthyroidism accelerates bone turnover by significantly increasing bone resorption rates and matrix apposition rates. This study reveals faster bone remodeling cycles in hyperthyroid patients compared to healthy individuals.

    Area of Science:

    • Bone Biology
    • Endocrinology
    • Histomorphometry

    Background:

    • Hyperthyroidism is associated with increased bone turnover.
    • The precise mechanisms of altered bone remodeling in hyperthyroidism require further elucidation.

    Purpose of the Study:

    • To quantitatively compare bone resorption and formation dynamics between hyperthyroid patients and age/sex-matched controls.
    • To investigate the impact of hyperthyroidism on key histomorphometric parameters of bone remodeling.

    Main Methods:

    • In vivo tetracycline double labeling of iliac crest bone biopsies.
    • Reconstruction of resorption depth and formation thickness curves over time.
    • Comparison of histomorphometric parameters between 15 hyperthyroid patients and 13 controls.

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    Main Results:

    • Hyperthyroid patients exhibited a median resorption period approximately one-third that of controls (16 vs. 51 days).
    • Median resorption rate was over three times higher in hyperthyroid patients (3.8 vs. 1.1 microns/day).
    • Median initial matrix appositional rate was three times higher in hyperthyroid patients (4.8 vs. 1.6 microns³/micron²/day).

    Conclusions:

    • Hyperthyroidism significantly accelerates bone resorption and matrix apposition rates.
    • Bone remodeling cycles are markedly shortened in hyperthyroid individuals.
    • While resorption depth per cell is similar, the increased rate and faster apposition contribute to altered bone dynamics in hyperthyroidism.