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| Grade pathology | |
| 0 | Normal cartilage |
| I | Softening and swelling of articular cartilage |
| II | Fragmentation and fissuring of articular cartilage affecting an area of less than 0.5 inches |
| III | Fragmentation and fissuring of articular cartilage affecting an area greater than 0.5 inches |
| IV | Cartilage erosion to bone |
