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Modified Copenhaver classification.
| Grade | Criteria |
|---|---|
| 0 | Homogeneous eosinophilic staining collagen reinforced ground substance with normal chondrocytes |
| 1 | Discrete foci of mucinous, hyaline or myxoid degeneration and reduction of the chondrocyte concentration |
| 2 | Bands of mucinous degeneration bordering hypocellular regions of the meniscus without presence of a distinct cleavage plane |
| 3 | Mucinous degeneration with fibrocartilaginous separation |
