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    Morphometric measurements can improve prediction of progressive vertebral deformity following vertebral damage.

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    Author
    Annesley-Williams, DJ
    Keyword
    Clinical Imaging
    Creep
    Deformity
    Residual Strain
    Vertebral Damage
    Vertebral Morphometry
    
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    Abstract
    PURPOSE: A damaged vertebral body can exhibit accelerated 'creep' under constant load, leading to progressive vertebral deformity. However, the risk of this happening is not easy to predict in clinical practice. The present cadaveric study aimed to identify morphometric measurements in a damaged vertebral body that can predict a susceptibility to accelerated creep. METHODS: A total of 27 vertebral trabeculae samples cored from five cadaveric spines (3 male, 2 female, aged 36 to 73 (mean 57) years) were mechanically tested to establish the relationship between bone damage and residual strain. Compression testing of 28 human spinal motion segments (three vertebrae and intervening soft tissues) dissected from 14 cadaveric spines (10 male, 4 female, aged 67 to 92 (mean 80) years) showed how the rate of creep of a damaged vertebral body increases with increasing "damage intensity" in its trabecular bone. Damage intensity was calculated from vertebral body residual strain following initial compressive overload using the relationship established in the compression test of trabecular bone samples. RESULTS: Calculations from trabecular bone samples showed a strong nonlinear relationship between residual strain and trabecular bone damage intensity (R2 = 0.78, P < 0.001). In damaged vertebral bodies, damage intensity was then related to vertebral creep rate (R2 = 0.39, P = 0.001). This procedure enabled accelerated vertebral body creep to be predicted from morphological changes (residual strains) in the damaged vertebra. CONCLUSION: These findings suggest that morphometric measurements obtained from fractured vertebrae can be used to quantify vertebral damage and hence to predict progressive vertebral deformity.
    Citation
    Eur Spine J. 2021 Oct 6. doi: 10.1007/s00586-021-07013-w. Online ahead of print.
    Type
    Article
    URI
    http://hdl.handle.net/20.500.12904/14914
    Collections
    Trauma and Orthopaedics

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