Causative findings of false results on spot radiographs
| Findings | Numbers | |
|---|---|---|
| False-negative | ||
| Inadequate block | 10 | |
| Insufficient infiltration with injectate leakage | 4 | |
| Insufficient passage of injectate from a blockade by a huge herniated disk | 4 | |
| Intraepineural injection | 2 | |
| Not identified on spot radiographs | 10 | |
| False-positive | ||
| Overflow of injectate into the epidural space or into an adjacent affected level | 4 | |
| From an injected upper unaffected level | 2 | |
| From a injected lower unaffected level | 2 | |
| Not identified on spot radiographs | 4 | |