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Outerbridge Grading
| Grade 1 | Softening and swelling of the cartilage |
| Grade 2 | Fragmentation and fissuring in an area ≤½ in. in diameter |
| Grade 3 | Fragmentation and fissuring in an area >½ in. in diameter |
| Grade 4 | Erosion of cartilage down to the bone |
