| Outcome Nurick | Preop. Nurick | Preop. signal | Procedure | Age/Sex/ Comorbidity | author |
| 4 | 3 | Yes | Double ACDF, platting | M59 | Chin et al. 2013 |
| 4 | 3 | Yes | Double ACDF, interbody cage | 64 M | Giammalva et al. 2017 |
| 4 | 1 | Yes | Posterior C4-7 Lateral mass fixation C3-7 | 68 M | Antwi et al. 2018 |
| N/A | 1 | Not appeared | Posterior C1 Laminectomy, superior part of C2 lamina | 41 M | Wiginton JG et al. 2019 |
| 4 | 3 | No | Posterior C3-C6, lateral mass fixation C2-7 | 79 M Hypertension/ Atrial fibrillation | Papaioannou et al. 2018 |
| 1 | 4 | Yes | Posterior C3-5 Lateral mass C2-6 | 79 M Hypertension | Mathkour et al. 2020 |