Table 1 Modified Mankin's histological scores

   Normal

0

   Surface irregularities

1

   Pannus and surface irregularities

2

   Clefts to transitional zone

3

   Clefts to radial zone

4

   Clefts to calcified zone

5

   Complete disorganization

6

Cartilage cells

   Normal

0

   Pyknosis, lipid degeneration hypercellularity

1

   Clusters

2

   Hypocellularity

3

Safranin-O, thionine, Alcian blue

   Normal

0

   Slight reduction

1

   Moderate reduction

2

   Severe reduction

3

   No staining

4

Tidemark integrity

   Intact

0

   Destroyed

1