Fig. 3From: Accuracy of pedicle screw insertion for unilateral open transforaminal lumbar interbody fusion: a side-by-side comparison of percutaneous and conventional open techniques in the same patientsEvaluation of pedicle screw misplacement. a Normal. b Minor perforation (<ā3āmm). c Moderate perforation (3ā6āmm). d Severe perforation (>ā6āmm)Back to article page