Eight patients had atlanto-axial instability. Six had interlaminar fusion between atlas and axis. No serious complications were seen. Stability was obtained in all patients postoperatively.

Atlanto-occipital Dislocation (AOD): A severe injury involving the dislocation of the joint between the skull and the first cervical vertebra, often resulting from trauma. Ligamentous Instability ...

The range of atlanto-occipital joint angle (ROM) depends on the prey habitat, and the way cetaceans use to capture prey. The cetaceans that prefer benthic/demersal prey had a relatively large ROM ...