Table 2 Mankin score for evaluation of articular cartilage degeneration

I

Structure

a. Normal

0

b. Surface irregularity

1

c. Pannus and surface irregularity

2

d. Clefts to transitional zone

3

e. Clefts to radial zone

4

f. Clefts to calcified zone

5

g. Complete disorganization

6

II

Cells

a. Normal

0

b. Diffuse hypercellularity

1

c. Cloning

2

d. Hypocellularity

3

III

Safranin–Orange staining

a. Normal

0

b. Slight reduction

1

c. Moderate reduction

2

d. Severe reduction

3

e. No dye note

4

IV

Tidemark integrity

a. Intact

0

b. Crossed by blood vessels

1