Traynelis classification of atlanto-occipital dissociation (diagrams)

Case contributed by Assoc Prof Craig Hacking

Diagrams of the types of AOD.

Case Discussion

The Traynelis classification of atlanto-occipital dislocations describes injuries of the atlanto-occipital joint according to the displacement of the occipital condyles relative to the atlas:

  • type I: anterior displacement
  • type II: distraction (inferior displacement)
  • type III: posterior displacement

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