Check atlas arches, particularly for fracture.Check dens for fracture, agenesis, & non-union.Check pedicles for osteolytic activity and rotation.Check for spina bifida, fracture (double spinous process sign).Check transverse processes for fracture.Check uncinate processes for fracture & degeneration.> 5 mm indicates complete transverse ligament rupture and instability.> 3.5 mm indicates injury to transverse ligament. Rule to remember: ’7 at 2 & 2 at 7’: 7 mm at C2 and 2 cm at C7
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