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Table 2 Interpretation of pedicle screw placement

From: Lumbosacral pedicle screw placement using a fluoroscopic pedicle axis view and a cannulated tapping device

Screw placement No. of screws (%)
Adequate insertion 817 (95.7)
Misplacement 37 (4.3)
 Minor (cortical perforation <3 mm) 28 (3.3)
 Moderate (cortical perforation 3–6 mm) 7 (0.8)
 Severe (cortical perforation >6 mm) 2 (0.2)
  1. No. number