Fig. 2
From: Pullout strength of reinserted pedicle screws using the previous entry point and trajectory
Radiographs identifying the depth of insertion. a Experimental screw was removed after being completely inserted in one pedicle and was then reinserted completely. b Experimental screw was removed after 80% of the total trajectory was reached and then reinserted completely. c Experimental screw was removed after 60% of the total trajectory was reached and then reinserted completely