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Representative sections of articular osteochondroid tissues stained with Safranin O and magnified at 50x. (a) Grade 3: simple fissure in cartilage with surface abrasion and matrix loss within superficial zone. (b) Grade 3.5: branched fissure extending to the deep zone of cartilage. (c) Grade 4.5: erosion of the cartilage with fibrillated surfaces and mid zone excavation. (d) Grade 5.5: denudation of cartilage with reparative fibrocartilage tissue in bone surface.
