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Table 1 The OA Grading Table

From: Exosomes from embryonic mesenchymal stem cells alleviate osteoarthritis through balancing synthesis and degradation of cartilage extracellular matrix

Scores Osteoarthritis damage
0 Normal
0.5 Loss of Safranin O without structural changes
1 Small fibrillations without loss of cartilage
2 Vertical clefts down to the layer immediately below the superficial layer and some loss of surface lamina
3 Vertical clefts/erosion to the calcified cartilage extending to <25% of the articular surface
4 Vertical clefts/erosion to the calcified cartilage extending to 25–50% of the articular surface
5 Vertical clefts/erosion to the calcified cartilage extending to 50–75% of the articular surface
6 Vertical clefts/erosion to the calcified cartilage extending >75% of the articular surface