Table 2.
ISO-C use and screw demographics
| ISO-C use and screw demographics | Number |
|---|---|
| ISO-C CT used | 67 (77.0%) |
| Postoperative CT also used | 23 (26.4%) |
| Postoperative CT not used | 44 (50.6%) |
| ISO-C CT Not Used | 20 (23.0%) |
| Postoperative CT also used | 7 (8.0%) |
| Postoperative CT not used | 13 (14.9%) |
| Number of patients who had screws changed based on ISO-C image | 7 patients (8%) |
| Number of screws changed based on ISO-C image | 9 screws (1.2%) |
| Breakdown of changed screws | |
| Lateral mass | 3 screws (3.5% per patient) |
| Removed | 2 screws |
| RT C6—lateral breakout | |
| LT C6— lateral breakout | |
| Shortened | 1 screw |
| LT C4—shortened 2 mm to 10 mm | |
| Pedicle | 3 screws (4.8% per patient) |
| Repositioned | 3 screws |
| 2 T1—lateral breakout | |
| RT T1—lateral breakout | |
| Occipital | 0 screws |
| C2 Pars | 3 screws (20% per patient) |
| Removed | 2 screws |
| abutting vertebral arteries | |
| Repositioned | 1 screw |
| LT crossed facet joint | |
| Surgical revisions | |
| ISO-C was used | 0 revisions |
| ISO-C Not used | 1 revision |