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MRI-based grading system for cervical intervertebral disc degeneration.
| Grade | Nucleus signal intensity | Nucleus structure | Distinction of nucleus and annulus | Disc height |
|---|---|---|---|---|
| I | Hyperintense | Homogenous, white | Clear | Normal |
| II | Hyperintense | Inhomogenous with horizontal band, white | Clear | Normal |
| III | Intermediate | Inhomogenous, grey to black | Unclear | Normal to decreased |
| IV | Hypointense | Inhomogenous, grey to black | Lost | Normal to decreased |
| V | Hypointense | Inhomogenous, grey to black | Lost | Collapsed |
