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Transmenopausal changes in cortical bone quality.

E P Paschalis1, S Gamsjaeger1, S Bare2

  • 1Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of OEGK and AUVA Trauma Centre Meidling, 1st Medical Department, Hanusch Hospital, Heinrich Collin Str. 30, A-1140 Vienna, Austria.

Bone
|July 30, 2024
PubMed
Summary
This summary is machine-generated.

Menopause significantly reduces the organic matrix in newly formed bone, impacting bone quality. However, mineral content and other material properties in cortical bone remain unchanged post-menopause.

Keywords:
Bone qualityCortical boneMenopauseRaman microspectroscopic analysis

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Area of Science:

  • Bone biology
  • Menopause research
  • Biomaterials science

Background:

  • Bone fracture resistance relies on bone quantity and quality, including structural and material properties.
  • Menopause elevates bone turnover rates, potentially altering bone material composition.
  • Previous studies noted decreased organic matrix and modulated glycosaminoglycans in cancellous bone post-menopause.

Purpose of the Study:

  • To investigate menopause-induced changes in cortical bone's material and compositional properties.
  • To analyze the mineral/matrix ratio, proteoglycan content, mineral maturity, and collagen cross-links in cortical bone.
  • To compare these properties in freshly formed bone (osteons) and interstitial bone before and after menopause.

Main Methods:

  • Raman microspectroscopic analysis of paired iliac crest biopsies.
  • Biopsies collected from healthy females before and one year after menopause onset.
  • Quantification of mineral/matrix ratio, proteoglycans, mineral crystallinity, and pyridinoline cross-links in cortical bone.

Main Results:

  • A significant decline in freshly synthesized organic matrix content in cortical bone post-menopause.
  • No significant change observed in freshly deposited mineral content post-menopause.
  • No alterations in mineral/matrix ratio, proteoglycan content, mineral maturity, or pyridinoline cross-links in cortical bone.

Conclusions:

  • Menopause primarily affects the organic matrix synthesis in newly formed cortical bone, similar to cancellous bone findings.
  • Cortical bone's fundamental material and compositional properties remain stable shortly after menopause.
  • Further research may be needed to understand the long-term implications of these changes on bone health.