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Table 2 Grading system for chondral rim damage

From: Hip pathology: the diagnostic accuracy of magnetic resonance imaging

Grade of chondrosis Original Outerbridge classification Modified Outerbridge classification for acetabular chondrosis
1 Softening and swelling of cartilage Softening of cartilage
2 Fragmentation and fissuring in an area 1.5 cm or less in diameter Cleavage tear
3 Fragmentation and fissuring to the level of subchondral bone in an area with a diameter more than 1.5 cm Delamination
4 Exposed subchondral bone Erosion of cartilage down to exposed bone