- Etiology:
- Imaging: when measuring the atlanto-dens interval on lateral flexion / extension / neutral cervical spine radiographs, if the atlanto-dens interval is > 5 mm on any view there is instability, if there is > 1-2 mm of motion between flexion and extension there is instability
- DDX:
- Complications:
- Treatment:
- Clinical:
Radiology Cases of Atlanto Axial Instability
![Radiograph of atlanto axial instability](https://pediatricimaging.org/wp-content/uploads/2022/08/atlantoaxialinstability01mdtrisomy21cspinelatneutralflexext3yo.jpg?w=1024)