| Complications | Anterior | Posterior | |||
| Number | % | Number | % | P value | |
| Transient Laryngeal nerve palsy | 2 | 5.56 | 0 | 0.00 | 0.01 |
| Transient dysphasia | 2 | 5.56 | 0 | 0.00 | 0.01 |
| Carotid artery injury | 1 | 2.78 | 0 | 0.00 | 0.01 |
| Dural tear | 1 | 2.78 | 0 | 0.00 | 0.01 |
| Cord contusion | 1 | 2.78 | 0 | 0.00 | 0.01 |
| Screw loosening | 0 | 0.00 | 5 | 20.83 | 0.06 |
| Vertebral artery injury | 0 | 0.00 | 1 | 4.17 | 0.1 |