Assessment of the initial viscoelastic properties of a critical segmental long bone defect reconstructed with impaction bone grafting and intramedullary nailing

John Costi, Richard Stanley, Boyin Ding, Lucian Solomon

    Research output: Contribution to journalArticle

    1 Citation (Scopus)

    Abstract

    Introduction: This study compared the initial viscoelastic properties of a segmental tibial defect stabilized with intramedullary nailing and impaction bone grafting to that of a transverse fracture stabilized with intramedullary nailing. Materials and methods: Seven sheep tibiae were tested in compression (1000. N), bending and torsion (6. Nm) in a six degree-of-freedom hexapod robot. Tests were repeated across three groups: intact tibia (Intact), transverse fracture stabilized by intramedullary nailing (Fracture), and segmental defect stabilized with a nail and impaction bone grafting (Defect). Repeated measures ANOVA on the effect of group on stiffness/phase angle were conducted for each loading direction. Results: The Intact group was significantly stiffer than the Fracture and Defect groups in bending and torsion (p< 0.022 for both loading directions), and was marginal for the Defect group in compression (p= 0.052). No significant differences were found between the Fracture and Defect groups (p> 0.246 for all loading directions) for stiffness/phase angle. In compression and bending, phase angles were significantly greater for the Fracture and Defect groups compared to Intact (p< 0.025), with no significant differences between groups in torsion (p= 0.13). Sensitivity analyses conducted between the Fracture and Defect group differences found that they were not of clinical significance. Conclusion: The initial properties of a segmental defect stabilized with intramedullary nailing and impaction bone grafting was not clinically significantly different to that of a transverse fracture stabilized with intramedullary nailing.

    Original languageEnglish
    Pages (from-to)39-48
    Number of pages10
    JournalMedical Engineering and Physics
    Volume36
    Issue number1
    DOIs
    Publication statusPublished - Jan 2014

    Keywords

    • Bending stiffness
    • Biomechanical testing
    • Bone allograft
    • Compression stiffness
    • Fixation stability
    • Fracture stability
    • Impaction bone grafting
    • Phase angle
    • Segmental defect
    • Sheep
    • Tibia
    • Torsion stiffness

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