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Table 1 International Cartilage Repair Society classification

From: Usefulness of using laser-induced photoacoustic measurement and 3.0 Tesla MRI to assess knee cartilage damage: a comparison study

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