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The many adaptations of bone.

J D Currey1

  • 1Department of Biology, University of York, P.O. Box 373, York YO10 5YW, UK. jdc1@york.ac.uk

Journal of Biomechanics
|September 23, 2003
PubMed
Summary

Bone adaptations occur over both individual lifetimes and evolutionary time. This study explores how factors like bone structure, material properties, and hollowness contribute to mechanical adaptation across different timescales.

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Area of Science:

  • * Bone biology and biomechanics
  • * Evolutionary adaptations in skeletal structures

Background:

  • * Bone remodeling and adaptation are typically studied within an individual's lifetime.
  • * Evolutionary timescales also produce significant bone adaptations.
  • * Understanding adaptations across both short and long timescales is crucial.

Purpose of the Study:

  • * To survey bone adaptations occurring across individual and evolutionary timescales.
  • * To evaluate the relative importance of short-term versus long-term bone adaptation.
  • * To examine specific examples of bone adaptation, including material composition and architecture.

Main Methods:

  • * Review and synthesis of existing studies on bone structure and mechanical properties.
  • * Analysis of bone tissue types (woven vs. lamellar) and their mechanical competence.
  • * Examination of stress concentration factors within bone cavities and their orientation.
  • * Investigation of the relationship between mineral content, stiffness, and toughness.
  • * Consideration of whole bone architecture and material property synergy during growth.
  • * Discussion of secondary remodeling processes and their proposed functions.
  • * Analysis of bone hollowness in relation to animal lifestyle.

Main Results:

  • * Woven bone, while less mechanically competent, is found in rapidly growing bones.
  • * Bone cavity orientation and lamellar flow generally minimize stress concentration, though elastic anisotropy can enhance it.
  • * Mineral content is a key determinant of bone stiffness and toughness, varying to optimize mechanical needs.
  • * Bone architecture adapts concurrently with material property changes during growth for optimal mechanical behavior.
  • * Secondary osteone formation may serve roles in mineral homeostasis, dead bone removal, or microcrack repair.
  • * Bone hollowness is demonstrably adapted to the specific life requirements of different animals.

Conclusions:

  • * Bone adaptations occur across both developmental and evolutionary timescales.
  • * Material properties (mineralization) and structural organization (architecture, hollowness) are finely tuned for specific mechanical demands.
  • * Further research is needed to fully elucidate the interplay between short-term and long-term adaptations in bone biomechanics.

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