The Denis classification of sacral fractures. A: The 3 zones (Zone I, alar region fracture; Zone II, foraminal region fracture; Zone III, central canal region fracture). B: Zone II fracture going through the sacral foramina. C: Image showing normal sacral anatomy with reference to the L-5 nerve root (left) and a Zone II fracture causing compression of the L-5 nerve root (right). D: Sagittal views of normal sacrum (left), a Zone III burst fracture (middle), and a Zone III fracture dislocation (right). ...
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