Grades | Criteria |
---|---|
Grade 0 | No fibrosis affecting the dura mater |
Grade I | Only a thin fibrous band between the scar tissue and dura |
Grade II | Adhesion continues to progress but does not cover the entire laminectomy defect (less than 2/3) |
Grade III | Scar tissue adhesion is larger, constituting more than 2/3 of the laminectomy defect or extending to the nerve root |