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Lumbar pedicle screw placement accuracy grades according to the Gertzbein-Robbins classification system.
| GRS Grade | SP-OLIF (O-Arm) | C-OLIF (C-Arm) | p-Value |
|---|---|---|---|
| Grade A | 139/144 (96.5%) | 77/80 (96.3%) | 0.915 |
| Grade B | 5/144 (3.5%) | 3/80 (3.8%) | 0.915 |
| Grade C | 0/144 (0%) | 1/80 (1.3%) | 0.179 |
| Grade D, E | 0/144 (0%) | 0/80 (0%) | 1.000 |
GRS, Gertzbein-Robbins classification system of pedicle screw accuracy.
