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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