Complication learning curve – Screw malposition and adjustment due to intraoperative CT.
| First 50 April 2008 – Mar 2010 | Second 50 May 2010 – August 2011 | Third 50 Sept 2011 – October 2012 | Total | |
|---|---|---|---|---|
| Screws adjusted due to CT | 4/216 screws = 1.9% | 3/209 screws = 1.4% | 1/202 screws = 0.5% | 8/627 screws = 1.3% |
|
TOTAL adjusted trajectories + Screws
(EMG + CT) |
11/216 screws = 5.1% |
9/209 screws = 4.3% |
4/202 screws = 2.0% |
24/627 screws = 3.8% |
Note: Some adjusted screws were malpositioned on intraoperative CT, as well as EMG signal positive.