Open Access
Table 1.
Outerbridge classification.
| Grade 1: swelling and softening of articular cartilage, possibly with additional fissures on the surface. |
| Grade 2: a partial-thickness defect with fissures on the surface that do not reach subchondral bone or exceed 1.5 cm in diameter. |
| Grade 3: fissuring to the level of subchondral bone in an area with a diameter more than 1.5 cm. |
| Grade 4: exposed subchondral bone. |
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