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  • Title: Traumatic vertical atlantoaxial instability in a case of atlanto-occipital coalition.
    Author: Weiner BK, Brower RS.
    Journal: Spine (Phila Pa 1976); 1997 May 01; 22(9):1033-5. PubMed ID: 9152457.
    Abstract:
    STUDY DESIGN: This is a report of a woman with an atlanto-occipital coalition who experienced a traumatic vertical atlantoaxial facet dislocation and severe associated neurologic injury. OBJECTIVE: To describe the radiographic and pathoanatomic characteristics of the injury process. SUMMARY OF BACKGROUND DATA: Severe injuries of the occipito-atlantoaxial complex are uncommon and only rarely are associated with patient survival. This is the first report of this particular injury. METHODS: Plain radiography and tomography demonstrated the facet dislocation and instability of the injury. Surgical exploration for repair of the torn dura mater and bony arthrodesis demonstrated the gross pathoanatomy. RESULTS: The patient's vertical atlantoaxial instability was stabilized, her dura mater reconstructed, and her necrologic status has improved to allow mobilization with a cane. CONCLUSION: Vertical atlantoaxial instability has not been described previously. From the somewhat subtle radiographic findings, one might underestimate the severity of the neurologic damage. Aggressive work-up and management of this injury is suggested to avoid potential further necrologic sequelae.
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