“The Cervicocranium is defined as extending from the skull base through the second cervical intervertebral disk. Of the entire cervical spine, the Cervicocranium is the most difficult to evaluate radiographically because of its complex anatomy, the physiologic motions and normal variants that may simulate acute injury, and the inherent difficulty in obtaining a diagnostic study of the Cervicocranium in both frontal and lateral projections. These factors have particularly adverse implications in patients clinically suspected of having blunt Cervicocranial trauma, when it is impossible to obtain a useful open mouth view and given the fact that any injuries to the Cervicocranium are radiographically subtle.” Cervicocranium: its Radiographic Assessment." John H. Harris Jr, MD, DSc, Radiology 2001;218:337-351, P1
“AP OM neck lateral flexion weight bearing X-ray imaging study is considered a gold standard diagnostic test for determining CCI in the sagittal plane.” Occult Hypermobility of the Craniocervical Junction: A Case Report and Review”. Page 444 | june 2011 | volume 41 | number 6 | journal of orthopaedic & sports physical therapy