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Table 1 Modified O’Driscoll score

From: Experimentally induced cartilage degeneration treated by pulsed electromagnetic field stimulation; an in vitro study on bovine cartilage

Parameter Feature Grade
Safranin O staining Normal or nearly normal 3
Moderate 2
Slight 1
None 0
Surface regularity Smooth and intact 3
Superficial horizontal lamination 2
Fissures 25–100 % of the thickness 1
Severe disruption, including fibrillation 0
Cellularity Normal cellularity 3
Slight hypocellularity 2
Moderate hypocellularity 1
Severe hypocellularity 0
Chondrocyte clustering No clusters 2
<25 % of the cells 1
25–100 % of the cells 0
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