Patients with pedicle screw breach who underwent revision of malpositioned hardware.
| Patient # | Age, y | Gender | Diagnosis | Surgery Performed | Screw Levels | Reason for Revision | Postoperative Outcome |
| 1 | 68 | F | Deformity (severe degenerative scoliosis) | T4-ilium posterolateral fusion | L3 (right) and L5 (right) | Patient experienced right leg numbness and weakness. Imaging revealed the right L3 and L5 appeared to have a medial trajectory (both GRS E). Screw reposition was conducted to ensure optimal bony purchase. | New screws were GRS A. No postoperative screw-related complications were present. |
| 2 | 24 | F | Unstable L1 fracture | T12–L2 fusion | T12 (right) | Intraoperative O-arm imaging revealed the screw was lateral secondary to deflection at the entry site, so a more medial and slightly inferior trajectory was planned. This avoided a steep bone entry point and ensured better bony purchase in the flat portion of the posterior spine. | New screw was GRS A. No postoperative screw-related complications were present. |
Abbreviation: GRS, Gertzbein and Robbins scale.