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P525: ATLANTO-AXIAL FACET JOINT DISTRACTION USING INTERFACET CAGES FOR BASILAR INVAGINATION IN CHIARI MALFORMATION
Alexander F Kuffer, MD, DMD, PhD¹; Brian A Clampitt, MD²; Thomas Karadimas, MD²; Davide M Croci, MD²; ¹Lakeland Regional Health; ²University of South Florida

Basilar invagination is defined by the upward migration of the odontoid process into the foramen magnum, leading to compression of the medulla oblongata at the cranio-cervical junction (CCJ). Here, we report the case of a 33-year-old patient with progressive basilar invagination. Surgical management consisted of atlanto-axial cage distraction, expansile duroplasty and posterior cervical fusion from C1 to C5. Atlanto-axial cage distraction is an effective strategy to realign the CCJ in cases of basilar invagination. 

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