The study authors examined 26 patients who underwent L4-5 fusion with O-arm based navigation to insert the 104 screws. The researchers found one screw breached the pedicle laterally and noted seven screws with non-significant anteriolateral cortical perforations at the L5 level.
The average axial and sagittal navigational error was 2.3 degrees and 3.1 degrees respectively.
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