Stiff and strong compressive properties are associated with brittle post-yield behavior in equine compact bone material

C. M. Les, Susan M Stover, J. H. Keyak, K. T. Taylor, A. J. Kaneps

Research output: Contribution to journalArticle

38 Scopus citations

Abstract

Our hypothesis was that post-yield mechanical behavior of compact bone material in compression, defined as the stress, strain, or energy absorbed between 0.2% strain-offset and the point of maximum stress, is correlated with material density, modulus, strength, histomorphometric evidence of remodeling, and post-failure gross specimen morphology. Post-yield behavior of compact bone material from the third metacarpal bone of 10 horses, ages 5 months to 20 years, was investigated using single-load compression-to-failure. The post-yield stress, strain, and absorbed energy were compared with the compressive elastic modulus, yield stress, ash density, post-failure macroscopic appearance of the specimen, and histologic evidence of remodeling. High values of elastic modulus, yield stress, and ash density were associated with low values of post-yield mechanical properties (stress, strain, and absorbed energy). Macroscopic post-failure morphology was associated with post-yield mechanical behavior, in that specimens displaying fractures were associated with lower post-yield mechanical properties, and that those without evidence of frank fracture were associated with higher post-yield mechanical properties. Microscopic evidence of remodeling activity was associated with high post-yield mechanical properties, but not with gross post-failure morphology. There was an abrupt change from relatively high values to extremely low values of post-yield mechanical properties at intermediate levels of ash density. This feature may serve as a functional upper limit to the maximization of bone material stiffness and strength.

Original languageEnglish (US)
Pages (from-to)607-614
Number of pages8
JournalJournal of Orthopaedic Research
Volume20
Issue number3
DOIs
StatePublished - 2002

Keywords

  • Bone
  • Equine
  • Mechanical testing
  • Metacarpus
  • Post-yield behavior

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine

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