μCT-based measurement of cortical bone graft-to-host union

David G. Reynolds, Saad Shaikh, Mark Owen Papuga, Amy L. Lerner, Regis J. O'Keefe, Edward M. Schwarz, Hani A. Awad

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

Evaluation of structural bone grafts risk of failure requires noninvasive quantitative predictors of functional strength. We hypothesized that a quantitative graft-to-host union biometric would correlate significantly with biomechanical properties as a surrogate for the risk of fracture. To test this, we developed a novel algorithm to compute the union between host callus and graft, which was termed the union ratio. We compared the union ratio of live autografts to devitalized allografts implanted into the mid-diaphysis of mouse femurs for 6 and 9 wk. Surprisingly, the autograft union ratio decreased from 0.228 ± 0.029 at 6 wk to 0.15±0.011 at 9 wk (p < 0.05) and did not correlate with the torsional properties of the autografts. The allograft union ratio was 0.105 ± 0.023 at 6 wk but increased to 0.224 ± 0.029 at 9 wk (p < 0.05). As a single variable, the union ratio correlated significantly with ultimate torque (R2 - 0.58) and torsional rigidity (R2 = 0.51) of the allografts. Multivariable regression analyses of allografts that included the union ratio, the graft bone volume, the maximum and minimum polar moment of inertia, and their first-order interaction terms with the union ratio as independent variables resulted in significant correlations with the ultimate torque and torsional rigidity (adjusted R2 = 0.80 and 0.89, respectively). These results suggest that, unlike live autografts, the union between the devitalized allograft and host contributes significantly to the strength of grafted bone. The union ratio has important clinical implications as a novel biometric for noninvasive assessment of functional strength and failure risk.

Original languageEnglish
Pages (from-to)899-907
Number of pages9
JournalJournal of Bone and Mineral Research
Volume24
Issue number5
DOIs
StatePublished - May 2009

Keywords

  • Allograft
  • Autograft
  • Biomechanics
  • Bone
  • Nonunion
  • μCT

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