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Age-dependent biomechanical modifications in bone.

Deepak Vashishth1

  • 1Department of Biomedical Engineering, Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, 110 8th Street, Troy, NY 12180, USA. vashid@rpi.edu

Critical Reviews in Eukaryotic Gene Expression
|February 14, 2006
PubMed
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Aging bone loses fracture resistance due to decreased material quality, not just mass. This review explores ultrastructural, lamellar, osteonal, and tissue-level changes impacting bone toughness and fracture risk in older adults.

Area of Science:

  • Biomedical Engineering
  • Gerontology
  • Orthopedics

Background:

  • Age-related fractures pose a significant public health challenge.
  • Reduced bone mass is often cited, but age-related decline in bone material toughness is also critical.
  • Mechanisms behind age-related toughness loss remain unclear, potentially involving bone material quality alterations.

Purpose of the Study:

  • To review and identify changes in bone material quality contributing to age-related biomechanical decline.
  • To elucidate the mechanisms underlying the loss of bone toughness with aging.
  • To explore the role of genetics in regulating bone quality.

Main Methods:

  • Comprehensive literature review of studies on aging human bone.
  • Analysis of changes at ultrastructural, lamellar, osteonal, and tissue levels.

Related Experiment Videos

  • Examination of biomechanical and biological mechanisms affecting bone fracture resistance.

    • Main Results:

    • Identified alterations in bone material quality across multiple organizational levels (ultrastructural to tissue).
    • These changes systematically degrade mechanical and biological mechanisms responsible for bone's fracture resistance.
    • Animal studies suggest genetics may play a role in regulating bone quality, similar to bone mass.

    Conclusions:

    • Changes in bone material quality are plausible contributors to age-related loss of bone toughness.
    • A multi-level breakdown of bone's resistance mechanisms occurs with aging.
    • Further research into bone quality regulation, potentially including genetics, is warranted.