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Giannini classification.
| Type of Lesion | Surface | Extension | Treatment |
|---|---|---|---|
| Acute | |||
| I | Damaged | <1 cm² | Debridement |
| II | Damaged | ≥1 cm² | Fixation |
| Chronic | |||
| 0 | Intact | Any | Drilling |
| I | Damaged | <1.5 cm² | Microfractures |
| II | Damaged | ≥1.5 cm² | Cartilage replacement |
| IIA | Damaged | ≥1.5, >5 mm deep cm² | Cartilage replacement and bone graft |
| III | Damaged | ≥1 cm² | Osteochondral massive graft |
