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Related Experiment Videos

Structural changes with aging in cortical bone of the human tibia

C Nyssen-Behets1, P Y Duchesne, A Dhem

  • 1Institut d'Anatomie, Université de Mons-Hainaut, Mons, Belgium.

Gerontology
|January 1, 1997
PubMed
Summary
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Aging bone shows increased porosity and unique osteon structures, suggesting a progressive bone breakdown and repair process that impacts bone quality over time.

Area of Science:

  • Bone biology and aging research
  • Skeletal tissue microstructure
  • Age-related changes in bone quality

Background:

  • Bone quality and strength significantly decline with age due to structural modifications.
  • Senescent compact bone exhibits increased heterogeneity, including altered osteon mineralization and structure.
  • Specific osteon types (hypermineralized, notched canal, double-zone) differ from typical haversian remodeling structures.

Purpose of the Study:

  • To investigate age-related structural modifications in human compact bone.
  • To analyze the prevalence and characteristics of specific osteon types in young and aged individuals.
  • To explore the potential mechanism linking hypermineralized lamellae, notched canals, and double-zone osteons.

Main Methods:

  • Microradiographic and histomorphometric analysis of undecalcified human tibia sections.

Related Experiment Videos

  • Inclusion of samples from young men (18-39 years), aged men (50-92 years), and aged women (57-96 years).
  • Quantification of intracortical porosity, haversian structures, canal diameters, and specific osteon types.

    • Main Results:

    • Intracortical porosity and haversian structures increase with age, particularly in women.
    • Osteons with hypermineralized lamellae, notched canals, and double-zone structures are prevalent even in young adults.
    • Only osteons with notched canal walls significantly increase in frequency with age.

    Conclusions:

    • The three studied osteon types represent a progressive mechanism of bone disintegration and repair, distinct from typical haversian remodeling.
    • Hypermineralized lamellae may crumble, forming notched canals, which can then be refilled to create double-zone osteons.
    • This progressive mechanism contributes to altered bone quality and increased intracortical porosity with aging.