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Outerbridge Classification.
| Grade I | Softening of the cartilage. |
|---|---|
| Grade II | Fragmentation and fissure in an area with a diameter of 1.5 cm or less. |
| Grade III | Fragmentation and fissure in an area with a diameter greater than 1.5 cm. |
| Grade IV | Erosion of the subchondral cartilage. |
