Table 1 International Cartilage Repair Society (ICRS) Hyaline Cartilage Lesion Classification System [23]
Grade | Subgrade | Definition | Characteristics |
|---|---|---|---|
0 | Normal | Normal | |
1 | A | Nearly Normal | Superficial lesions. Soft indentation |
B | A + and/or superficial fissures and cracks | ||
2 | Abnormal | Lesions extending down to <50% of cartilage depth | |
3 | A | Severely Abnormal | Cartilage defects extending down to >50% of cartilage depth |
B | A + Cartilage defects extending down to calcified layer | ||
C | A + B + not extending through the subchondral bone | ||
D | A + B + C+ blisters are included | ||
4 | Severely Abnormal |