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Bone maintenance and remodeling: a control system based on fatigue damage

D Taylor1

  • 1Mechanical Engineering Department, Trinity College, Dublin, Ireland. dtaylor@tcd.ie

Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society
|July 1, 1997
PubMed
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This study models bone microcrack growth and repair, revealing a self-regulating system for stable crack length control without complex measurement. This finding simplifies our understanding of bone

Area of Science:

  • Biomechanics
  • Biomaterials Science
  • Skeletal Biology

Background:

  • Bone is a dynamic tissue constantly undergoing damage, repair, and remodeling.
  • Understanding microcrack growth and repair mechanisms is crucial for bone health.
  • Existing models often lack the ability to explain precise crack length control in bone.

Purpose of the Study:

  • To develop a computational model of microcrack growth and repair in compact bone.
  • To investigate the self-regulating capabilities of bone's damage-repair system.
  • To explain and quantify the 'lazy zone' of remodeling equilibrium strains.

Main Methods:

  • Developed a microcrack growth model incorporating fatigue crack behavior from other materials.
  • Integrated a simplified repair model simulating a constant rate of crack length reduction.

Related Experiment Videos

  • Analyzed the resulting system's ability to control crack length without explicit measurement.

    • Main Results:

    • The combined model demonstrates stable and precise control of microcrack length.
    • This control is achieved without the need for crack-measuring transducers or active decision-making.
    • Quantified the limits of the 'lazy zone' for remodeling equilibrium strains.

    Conclusions:

    • Bone possesses an intrinsic, self-regulating mechanism for managing microcrack damage.
    • This mechanism bypasses the need for complex biological sensing and control systems.
    • The model provides a foundation for understanding in vivo bone adaptation and remodeling.