Spinal Neurosurgery | 2018 | Jonathan M. Parish, Domagoj Coric
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There are a number of different imaging modalities that can be used to confirm atlantoaxial instability. Plain film radiographs of the cervical spine can be used to assess the atlantodental interval (ADI). Cervical CT is necessary to assess the atlantoaxial bony anatomy as well as to assess the foramen transversarium at C1 and C2. In particular, CT scan should be used to estimate screw length, medial/lateral and cranial/caudal screw trajectory. MRI can also evaluate the extent of cervical cord compression or cord injury that has occurred due to atlantoaxial instability.
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