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Table 1 Outerbridge classification

From: Diffusion tensor imaging can detect the early stages of cartilage damage: a comparison study

Grade Property
0 Normal
1 Cartilage with softening and swelling
2 A partial-thickness defect with fissures on the surface that do not reach subchondral bone or exceed 1.5 cm in diameter
3 Fissuring to the level of subchondral bone in an area with a diameter more than 1.5 cm
4 Exposed subchondral bone