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 |