Score | Structure | Cellularity | Matrix staining | Tidemark integrity |
---|---|---|---|---|
Score 0 | Smooth surface | Normal arrangement | Normal staining | Normal and intact |
Normal appearance | ||||
Score 1 | Roughened surface | Clustering in the superficial layer or loss of cells up to 10% | Slight loss of stain | Disrupted |
Single crack or area of delamination | ||||
Score 2 | Multiple cracks | Disorganization or loss up to 25% | Moderate loss of stain | |
Moderate delamination | ||||
Score 3 | Fragmentation in cartilage or severe delamination | Cell rows absent or loss up to 50% | Severe loss of stain | |
Score 4 | Loss of fragments | Very few cells present | No stain present | |
Score 5 | Complete erosion to tidemark | |||
Score 6 | Erosion beyond tidemark |