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. 2014 May 31;55(5):255–260. doi: 10.3340/jkns.2014.55.5.255

Fig. 2.

Fig. 2

A 66-year-old female had C1-2 instability due to complication of rheumatoid arthritis. Postoperative X-ray and CT scans show that the screw was safely inserted through the C1 lateral mass and the C2 pedicle. A : Pre-operative MRI. B : Post-operative cervical X-ray. C and D : Postoperative CT scans.