| Motivations/ Suspicion of canal stenosis | No response | Efficient | Essential | Available | Costless | Other |
| No Response | 3 | 0 | 0 | 0 | 0 | 4 |
| X ray | 0 | 19 | 16 | 14 | 0 | 0 |
| CT scan | 0 | 71 | 40 | 28 | 2 | 0 |
| Myelography | 0 | 33 | 6 | 5 | 2 | 0 |
| Scintigraphy | 0 | 6 | 3 | 3 | 0 | 0 |
| MRI | 0 | 41 | 23 | 9 | 1 | 0 |
| SRG | 0 | 12 | 6 | 1 | 2 | 0 |