Table 2 ICRS classification as described by Mainil-Varlet et al. [2]
| Grade | Property |
|---|---|
| 1 | Superficial lesions, fissures and cracks, soft indentation |
| 2 | Defects that extend to less than 50% in depth |
| 3 | Defects that extend to more than 50% in depth |
| 4 | Complete loss of cartilage thickness, bone only |