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Anteroposterior diameter of the dura and spinal cord at each disc level. There was no significant difference in antero-posterior diameter of the spinal cord between the two groups. The only significant difference in antero-posterior diameter of the dura occurred at the C6/7, where it was significantly smaller in the C3-6 group. However, there was sufficient subarachnoid space for the spinal cord at C6/7
