The primary motion of the atlanto-occipital joint (C0 – C1) is lateral flexion, and the secondary motion is flexion/extension. While the primary motion of the atlanto-axial joint (C1 – C2 ...

The condition, bilateral atlanto occipital joint dislocation, is commonly known as internal or orthopedic decapitation. The injury is very rare in adults, and even more so in children." ...