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Table 1 Distribution of segments involved and pedicles used for fixation

From: Direct pedicle visualization and disc space orientation as the only guide for lumbar pedicular screw insertion

Segment involved Alone With upper level With lower level Screw/pedicle
L3-4 1 0 0 2/L3-2/L4
L4-5 11 0 7 36/L4-36/L5-14/S1
L5-S1 13 7 0 26/L5-26/S1