Table 2 Krenn score – histopathological evaluation of the degeneration grade of the fibrocartilage (0–3)
Grade | Features |
|---|---|
0 | Normal histological morphology • Isomorphic chondrocytes • Homogeneously eosinophil-stained matrix • Regular cellularity |
1 | Low-grade degeneration • Low reduction of cellularity (small areas) • Inhomogeneous stained matrix • Small fissures in the matrix |
2 | Moderate degeneration • Moderate reduction of cellularity (large areas) • Variable size and shape of chondrocytes • Moderate fissures in the matrix |
3 | High-grade degeneration • Strong reduction of cellularity • Large areas of complete loss of chondrocytes • Reticular/basophilic stained matrix (mucoid degeneration) • Large fissures in the matrix (pseudocysts) |