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Modified Mankin score.
| Parameters | Grade |
|---|---|
| Pericellular Safranin O staining | |
| Normal | 0 |
| Slightly enhanced | 1 |
| Intensely enhanced | 2 |
| Background Safranin O staining | |
| Normal | 0 |
| Slight increase or decrease | 1 |
| Severe increase or decrease | 2 |
| No staining | 3 |
| Arrangement of chondrocytes | |
| Normal | 0 |
| Appearance of clustering | 1 |
| Hypocellularity | 2 |
| Cartilage structure | |
| Normal | 0 |
| Fibrillation in the superficial layer | 1 |
| Fibrillation beyond the superficial layer | 2 |
| Missing articular cartilage | 3 |
