Same radiographic views (A and B) as in Figure 1 and a lateral (C) xerographic image of the cervical portion of the vertebral column in a dog in which the atlanto-occipital articulation is considered normal for comparison. On the lateral (A) radiographic view, the cranial articular foveae of the atlas have luxated craniodorsally (white arrows) and are no longer articulating with the occipital condyles of the skull (black arrows). The atlantoaxial articulation is normal. Notice the alignment of the skull, atlas, and axis appear normal on the ventrodorsal (B) radiographic view; however, the cranial aspect of the atlas summates with the occipital condyles, and the joint space is not visible (white arrowheads).
Citation: Journal of the American Veterinary Medical Association 228, 4; 10.2460/javma.228.4.513