Traynelis classification of atlanto-occipital dislocations
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- type I: anterior displacement
- type II: longitudinal distraction (superior-inferior displacement)
- type III: posterior displacement
A limitation of this classification system is that rotatory or coronal malalignment are not taken into consideration.
Treatment and prognosis
Type I and III injuries are treated with longitudinal traction to reduce the dislocation followed by surgical fixation. Non-operative management including collar or halo immobilization is used for certain patients but has a high rate of failure. Persistent traction is contraindicated due to the increased rate of neurological complications.