Fig. 4.
Meniscus morphology and collagen fiber organization: (A) Normal appearance of extracellular matrix and collagen fiber organization, score 0. (B) Diffuse foci (•) of degenerated extracellular matrix (hyalin and/or mucoid), most of the collagen fibers are organized, score 1. (C) Bands or confluent foci of degenerated extracellular matrix substance (hyalin and/or mucoid), most of the collagen fibers appear unorganized, score 2. (D) Fibrocartilaginous separation (edema, hyaline and/or mucoid degeneration, cyst formation (♦), tears) with unorganized collagen fibers, score 3. Safranin O - Fast Green, 4x.