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Bone mineral alterations and Mg content in aging.

R Mongiorgi1, S Gnudi, A Moroni

  • 1Dip. Sc. Mineralogiche, Università di Bologna.

Bollettino Della Societa Italiana Di Biologia Sperimentale
|July 1, 1990
PubMed
Summary

Aging bone mass reduction is linked to qualitative changes in bone mineral structure. Older osteopenic patients showed increased magnesium and beta-tricalcium phosphate (beta-TCP) compared to younger subjects.

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Area of Science:

  • Biomineralization
  • Skeletal Aging
  • Bone Histology

Background:

  • Bone mass reduction is a hallmark of aging.
  • Osteoporosis, characterized by low bone mass, increases fracture risk.
  • Qualitative changes in bone mineral composition during aging are not fully understood.

Purpose of the Study:

  • To investigate if aging-related bone mass reduction is associated with changes in bone mineral structure.
  • To compare the mineral composition of cancellous bone between elderly osteopenic patients and younger non-osteopenic individuals.

Main Methods:

  • Analysis of 18 cancellous bone samples from femoral heads.
  • Chemical analysis to determine mineral content (e.g., Mg++).
  • X-ray diffraction to identify mineral phases (e.g., beta-TCP).

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Main Results:

  • A statistically significant increase in magnesium (Mg++) was observed in older osteopenic patients (Group A) compared to younger subjects (Group B).
  • X-ray diffraction revealed a significant presence of beta-tricalcium phosphate (beta-TCP) in the bone samples of older patients.
  • These findings indicate qualitative alterations in the mineral structure of aging skeletal tissue.

Conclusions:

  • Aging is associated with qualitative modifications in bone mineral structure, not just quantitative bone loss.
  • Increased magnesium and the presence of beta-TCP are indicators of these age-related mineral alterations.
  • These changes may contribute to the increased fragility and fracture risk observed in aging bone.