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Thread: Neck changes above the fusion in pediatric AIS patients with thoracic curves

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  1. #2
    Join Date
    Aug 2009
    Posts
    1,164

    Vertebral derotation and hypokyphsis

    This article:

    http://www.ncbi.nlm.nih.gov/pubmed/22691717

    uses 3D modeling to suggest that the cause of increased hypokyposis in thoracic patients is not the pedicle screw, per se, but the amount of vertebral derotation that this construct makes possible. (that is, scoliosis not only shifts the spine side to side, but sort of twists it. In addition to just making the spine straight side to side (what they're calling correcting the coronal deformity), surgeons using pedicle screws may also try to detwist the spine - vertebral derotation - and this may cause the hypokyposis they're seeing after surgery in thoracic patients)

    Conclusions: "In the 3D simulation study, kyphosis was reduced after complete correction of the coronal and rotational deformity, but it was maintained after the coronal-only correction. These results proved the hypothesis that the vertebral derotation obtained by PS causes hypokyphosis of the thoracic spine."

    Translation: if they didn't derotate in the model, it didn't decrease the normal curve of the back. But when they did derotate, then they created hypokyphosis in the model.
    Last edited by hdugger; 12-29-2013 at 06:35 PM.

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