| Group 1 |
0 |
0 |
0 |
Normal architecture, smooth surface, cells intact with appropriate orientation |
| Group 2 |
2.0-2.5 |
2 |
4.0-5.0 |
Wavy and irregular surface, thinning of tibial plateau, diminished hemopoietic tissue with loss of bony spicule |
| Group 3 |
3.0-3.5 |
3 |
9.0-10.5 |
Fissures and matrix fibrillation extending deep into the mid zone, large number of necrotic chondrocytes |
| Group 4 |
4.0-4.5 |
3 |
12.0-13.5 |
Extensive erosion resulting in excavitation, subchondralhemopoietic tissue replaced by fibrous tissue, |
| Group 5 |
5.0-5.5 |
4 |
20.0-22.0 |
Denudation, complete loss of the cartilage and large cysts within the subchondral region |
| Group 6 |
2.0 |
2 |
4.0 |
Surface wavy and discontinued, regeneration of the cartilage as cell nest, cortical bone formation with microvasculature |
| Group 7 |
1.5 |
2 |
3.0 |
Fibrillation superficially, organized cartilage cells |
| Group 8 |
1.5 |
2 |
3.0 |
Few necrotic chondrocytes, few superficial fibrillation |
| Group 9 |
1.0 |
1 |
1.0 |
Superficial zone intact, regeneration with cell nest |
