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A 52-year-old female patient with traumatic os odontoideum and severe atlantoaxial instability. (a) Traumatic os odontoideum in sagittal view of computerized tomography. (b) Note the severe atlantoaxial instability in the extension lateral X-ray graphy. (c) In the flexion, lateral X-ray graphy demonstrated distraction of the C1 posterior arch and C2 spinous process. (d) C1 lateral mass-C2 transpedicular screw fixation has been showed in lateral plain radiography
