| Grade | Nurick classification system |
| 0 | No root or cord symptom |
| 1 | Roots signs or symptoms. No evidence of cord involvement |
| 2 | Signs and cord involvement. Normal gait |
| 3 | Gait abnormality. Able to be employed |
| 4 | Gait abnormality prevents employment. Able to ambulate only with assistance |
| 5 | Chair bound or bedridden |