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Table 2 Krenn score – histopathological evaluation of the degeneration grade of the fibrocartilage (0–3)

From: Calcification of the acetabular labrum of the hip: prevalence in the general population and relation to hip articular cartilage and fibrocartilage degeneration

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)