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Classification of disc degeneration
| Grade | Classification | Description |
|---|---|---|
| 0 | No degeneration | Normal endplate |
| 1 | Mild degeneration | Osteophyte reaction involving < 50% of the endplate |
| 2 | Moderate degeneration | Osteophyte reaction involving between 50% and 100% of the endplate |
| 3 | Severe degeneration | Osteophyte reaction involving 100% of the endplate |
| 4 | Complete ankylosis | Fusion |
