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Hepple Classification (MRI).
| Stage | MRI Characteristics |
|---|---|
| I | Articular cartilage damage only |
| IIA | Cartilage damage with underlying fracture and surrounding bony edema |
| IIB | IIA without bony edema |
| III | Detached but undisplaced fragment |
| IV | Detached and displaced fragment |
| V | Subchondral cyst formation |
