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Table 9 Schematic overview of the histological grading system used in this study

From: A longitudinal study on the performance of in vivo methods to determine the osteochondrotic status of young pigs

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