Table 2: MRI grading system with arthroscopic correlation for osteochondral lesions of the talus.
| Stage |
Definition |
| 0 |
Normal Cartilage |
| I |
Abnormal cartilage signal but intact |
| II |
Fibrillation or fissures in cartilage not extending to bone |
| III |
Cartilage flap present or bone exposed |
| IV |
Loose nondisplaced osteochondral fragment |
| V |
Displaced osteochondral fragment |
Mintz DN, Tashjian GS, Connell DA, Deland JT, O' Malley M, Potter HG. Osteochondral lesions of the talus: a new magnetic resonance grading system with arthroscopic correlation. Arthroscopy. 2003;19(4):353-9.