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Figure 7: (a) Lateral radiograph in extension and (b) flexion of the neck in a patient with os odontoideum with reducible AAD where the hypermobility of atlas over axis led to thecal compression in both extension and flexion of the neck. Therefore, C1-2 fusion had to be performed in neutral position of the neck after alignment of os odonteum with rest of C2 body had been determined. (c) Lateral radiograph of CVJ showing AAD with occipitalized atlas in another patient. (d) The sublaminar wire loops into the spinal canal causing thecal compression

Figure 7: (a) Lateral radiograph in extension and (b) flexion of the neck in a patient with os odontoideum with reducible AAD where the hypermobility of atlas over axis led to thecal compression in both extension and flexion of the neck. Therefore, C1-2 fusion had to be performed in neutral position of the neck after alignment of os odonteum with rest of C2 body had been determined. (c) Lateral radiograph of CVJ showing AAD with occipitalized atlas in another patient. (d) The sublaminar wire loops into the spinal canal causing thecal compression