Grade | Classification | Signs |
---|---|---|
0 | Normal | Vessels with erythrocytes, No necrotic areas, No irregularities on ossification front, Normal thickness of cartilage |
1 | Normal-Mod | Vessels with erythrocytes, Few to no very small necrotic areas, Some irregularities on ossification front, Some mild focal thickening of cartilage |
2 | Moderate | Vessels with/without erythrocytes, Some mild necrotic areas (not large), Mild irregularities on ossification front, Moderate focal thickening of cartilage |
3 | Mod-Severe | Vessels mostly without erythrocytes, Some large necrotic areas, Distinct irregularities on ossification front, areas of thickened cartilage |
4 | Severe | Vessels without or with extremely few erythrocytes, very large necrotic areas, Very severe irregularities of ossification front, Severe thickening of cartilage areas |