Positioning Performance of Power and Manual Drivers in Posterior Spinal Fusion Procedures

Figure 9

Reference point deviations are shown for manual and power drivers. Median lines are shown within boxes; hash marks represent the outer quartile range. Outliers are shown in red. Mean values for the manual driver are 1.54, 2.30, and 1.94 mm from left to right. Mean values for the power driver are 2.45, 3.05, and 2.26 mm from left to right.