Failure mechanisms in human vertebral cancellous bone

David P Fyhrie, M. B. Schaffler

Research output: Contribution to journalArticle

180 Scopus citations

Abstract

Specimens of human vertebral cancellous bone were compressed to well past mechanical failure (15% strain) in the infero-superior direction. The mechanisms of failure were examined microscopically and histologically. The primary mechanism of failure was shown to be microscopic cracking rather than overt failure of the trabecular elements. The morphology of the cracks was consistent with an hypothesis that they were the result of shear stress (or strain) in the tissue. Complete fracture of trabeculae was confined to elements oriented transversely to the direction of loading. The tissue's ultimate strength and residual strength after compressive failure were both strongly correlated to tissue stiffness (R2 = 0.88 and R2 = 0.71, respectively). It is proposed that cancellous bone strength may be a consequence of the adaptation of bone stiffness to applied stresses. With removal of the load, all specimens recovered at least 94% of their original height. Implications of energy dissipation by microcracking for recovery and maintenance of overall trabecular architecture are discussed.

Original languageEnglish (US)
Pages (from-to)105-109
Number of pages5
JournalBone
Volume15
Issue number1
DOIs
StatePublished - 1994
Externally publishedYes

Keywords

  • Cancellous bone
  • Fracture
  • Microcrack
  • Microdamage
  • Stiffness
  • Strength

ASJC Scopus subject areas

  • Physiology
  • Hematology

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