Dallas Classification of Disc Degeneration on CT-Discograms
| Degeneration (Annulus) | Annular disruption (Contrast Extension) |
|---|---|
| 0 - No change | 0 - None |
| 1 - Local (<10%) | 1 - Into inner annulus |
| 2 - Partial (<50%) | 2 - Into outer annulus |
| 3 -Total (>50%) | 3 -Beyond outer annulus |