Spine Implant Failure after C1-C2 Fixation

The paper presents two clinical cases of the patients with different congenital craniovertebral junction deformities who developed rare delayed complications after the treatment and provides critical analysis of related literature data. CAAD is a complex multiplanar deformation, whose treatment requires a differential approach and depends on a kind of congenital anomalies and a load placed on instrumentation fixing points. Maximally symmetric positioning of the implants can help to avoid the recurrence or formation of a new anomaly in the postoperative period. A facet joint block prevents the formation of postoperative lateral atlantoaxial dislocation (LAAD).