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The spinal cord occupation rate of the dural sac in the anteroposterior diameter on flexion and extension. The spinal cord occupation rate was significantly lower on extension than on flexion at the C3/C4 and C4/C5 levels. Conversely, it was significantly lower on flexion than on extension at the C6/C7 level. ***p < 0.0001, *p < 0.05.
