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| Grade 0 | No root or cord symptoms |
| Grade I | Root signs or symptoms. No evidence of cord involvement. |
| Grade II | Signs of cord involvement. Normal gait. |
| Grade III | Mild gait abnormality. Able to be employed |
| Grade IV | Gait abnormality prevents employment. |
| Grade V | Able to ambulate only with assistance. |
| Grade VI | Chair bound or bedridden |
