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The spinal cord occupation rate of the dural sac in the cross-sectional area on flexion and extension. The spinal cord occupation rate was significantly lower on extension than on flexion at the C2/C3 and C3/C4 levels. Conversely, it was significantly lower on flexion than on extension from the C4/C5 level to the C6/C7 level. ***p < 0.0001, **p < 0.01, *p < 0.05.
