Table 3.
Description of Cervical Pedicle Screws and Overall Accuracy.
| N = 35 Levels | |
|---|---|
| Vertebral level | |
| C2 | 6 (17.1%) |
| C3 | 7 (20.0%) |
| C4 | 6 (17.1%) |
| C5 | 6 (17.1%) |
| C6 | 6 (17.1%) |
| C7 | 4 (11.4%) |
| Laterality | |
| Left | 15 (42.9%) |
| Right | 20 (57.1%) |
| Screw placement time (minutes) | 6.8 (3.8) |
| Gertzbein and Robbins grade | |
| A | 19 (54.3%) |
| B | 6 (17.1%) |
| C | 7 (20.0%) |
| D | 1 (2.9%) |
| E | 2 (5.7%) |
| Breach distance (mm) | 2.8 (2.00) |
| Breach direction | |
| Lateral | 3 (18.7%) |
| Medial | 13 (81.3%) |
| Breach distribution † | |
| C2 | 1 (16.6%) |
| C3 | 5 (71.4%) |
| C4 | 4 (66.6%) |
| C5 | 3 (50.0%) |
| C6 | 2 (33.3%) |
| C7 | 1 (25.0%) |
Data is displayed as mean (standard deviation); Categorical data is displayed as the total number (percentage).
†Percentages calculated by number of breached screws divided by number of screws placed per level.