Table 1.
Modified Mankin’s Histological Score for Cartilage Evaluation
| Cartilage structure | |
| Normal | 0 |
| Surface irregularities | 1 |
| Pannus and surface irregularities | 2 |
| Clefts to transitional zone | 3 |
| Clefts to radial zone | 4 |
| Clefts to calcified zone | 5 |
| Complete disorganization | 6 |
| Cartilage cells | |
| Normal | 0 |
| Pyknosis, lipid degeneration hypercellularity | 1 |
| Clusters | 2 |
| Hypocellularity | 3 |
| Safranin-O | |
| Normal | 0 |
| Slight reduction | 1 |
| Moderate reduction | 2 |
| Severe reduction | 3 |
| No staining | 4 |
| Tidemark integrity | |
| Intact | 0 |
| Destroyed | 1 |