Fig. 8From: Traumatic posterior Atlanto-axial dislocation: case report of an atypical C1-C2 dislocation with an anterior arch fracture of C1Axial slice of pre-reduction CT showing that the distance between the two fragments of the anterior arch of C1 less than the diameter of the odontoid process. The arrow displays the negative ADI from the anterior aspect of the dens to the posterior aspect of the anterior arch of C1Back to article page