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Procedure characteristics.
| Characteristic | IP technique (n = 25) |
OP technique (n = 21) |
P |
|---|---|---|---|
| Patient treated, n (%) | 23 (96.0) | 20 (95.2) | 0.567 |
| Patient failed, n (%) | 2 (4.0) | 1 (4.8) | |
| Correct spinal segment identification, n (%) | 24 (100) | 20 (100) | |
| Accuracy of US- guided injection confirmed by CT, n (%) | 22 (95.7) | 19 (95.0) | 0.720 |
| VAS (SD) after injection | 3.62 (0.81) | 3.21 (0.90) | 0.485 |
