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Pathological analysis scoring system of the peridural fibrosis and adhesion.
| Grade | Pathological features |
|---|---|
| Grade 0 | The dura is free of scar tissue |
| Grade 1 | Presence of only thin fibrous bands between dura and scar tissue |
| Grade 2 | Continuous adherence between dura and scar tissue involving <2/3 of laminectomy defect |
| Grade 3 | Scar tissue adherence ≥2/3 of laminectomy defect and/or extend to nerve roots |
