Unique paradoxical atlantoaxial dislocation with C1-C2 facet diastases and isolated ligamentous injury to the craniovertebral junction without neurological deficits: A case report.

Study Design: Retrospective review of the case file.

Objective: The primary objective was to report this rare case and discuss the mechanism of dislocation and technique of manual closed reduction of C1-C2 vertebrae in such scenarios.

Summary Of Background Data: Posterior atlantoaxial dislocation (AAD) is extremely rare and a few cases have been reported in English literature. This young man sustained a high speed car accident and survived an extreme hyperextension injury to the craniovertebral junction (CVJ) without any neurological deficits. On evaluation for neck pain he was noted with a dislocated odontoid lying in front of Atlas. There was C1-C2 facet diastases. No bony injury was noted at CVJ. Transverse axial ligament (TAL) was intact. He underwent a successful awake reduction of the dislocation. The joint had to be manually distracted, realigned, and released under the guidance of fluoroscopy. This was followed by single stage C1-C2 Goel's fusion with awake prone positioning. This patient was able to go back to work at the end of 3 months (GOS 5).

Conclusions: This condition is extremely rare, can be carefully reduced manually under adequate neuromonitoring, and requires C1-C2 fusion in the same sitting.