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. 2011 Mar;6(1):10–26.

Table 1.

Articular cartilage classification system.

Grade I Superficial lesions/cracks/indentations
Grade II Lesions extending <50% in depth
Grade III Lesions extending >50% in depth, not including subchondral bone
Grade IV Extending into subchondral bone

Higher grades indicate greater extent of depth in cartilage lesion.