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Table 2 Outerbridge score for macroscopic degenerative change[17]

From: Osteochondral tissue engineering using a biphasic collagen/GAG scaffold containing rhFGF18 or BMP-7 in an ovine model

Outerbridge score Explanation
Grade 0 Normal
Grade I Mild softening of the articular cartilage
Grade II Fibrillation and fissuring of chondral surface
Grade III Cracks in articular cartilage, no subchondral bone exposed
Grade IV Full thickness chondral defects down to bone