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. 2014 Oct 1;8:326–345. doi: 10.2174/1874325001408010326

Fig. (5).

Fig. (5)

3D CT scan of upper cervical spine. C1-C2 instability can easily be seen in the patient, as 70% of C1 articular facet is subluxed posteriorly (arrow) on C2 facet when the patient rotates his head (turns head to the left then the right).