I really don't know anything about this, but you can goolge it in or here's a site that decribes it. http://www.medscape.com/viewarticle/545253_4


________e-Type Fractures of the Thoracolumbar Spine: Imaging Analysis
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In This Article

Abstract and Introduction
Materials and Methods
Results
Discussion

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Figures
Tables
References



Discussion
Chance[1] described a unique hyperflexion injury of the lumbar spine resulting in a "horizontal splitting of the spine and neural arch" without "...any cord damage." Seventeen years later, Howland et al.,[5] unaware of Chance's earlier report, presented a similar case report of a "splitting apart" transverse fracture of a lumbar vertebra.


Fancylady