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Outerbridge grading of chondral surface lesions
| Grades | Description |
|---|---|
| Grade I | Softening and swelling of cartilage |
| Grade II | Fragmentation and fissuring, less than 0.5-inch-diameter lesion. |
| Grade III | Fragmentation and fissuring, greater than 0.5-inch-diameter lesion. |
| Grade IV | Erosion of cartilage down to exposed subchondral bone. |
