Atlantoaxial offset
Radiography (Odontoid)
X-ray computed tomography
Magnetic resonance imaging
Unilateral distance <2 mm
Combined right+left distance <6.9 mm
A distance more than 2 mm on each side is anormal.
Weissman BN. Imaging of Arthritis and Metabolic Bone Disease [With Access Code]. Elsevier Health Sciences. (2009).
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