Table 2 Mankin's histological histochemical grading
Category | Grade |
|---|---|
I. Structure | Â |
   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 |
II. Cells | Â |
   Normal | 0 |
   Diffuse hypercellularity | 1 |
   Cloning | 2 |
   Hypocellularity | 3 |
III. Safranin-O staining | Â |
   Normal | 0 |
   Slightly reduced | 1 |
   Moderate reduced | 2 |
   Severe reduced | 3 |
   No dye noted | 4 |
IV. Tidemark integrity | Â |
   Intact | 0 |
   Crossed by blood vessels | 1 |