C2 Body as “Keystone” in Management of C1-C2-C3 Dislocation Secondary to Congenital Absence of C2 Posterior Elements

Absence of the posterior arch of axis may be associated with adjacent C1-C2 along with C2-C3 dislocation, so both levels need to be addressed. The radiology should be critically evaluated for other structures developing from the C2 neural arch. It is important to include C2 to achieve a stable construct without compromising adjacent-level mobility.