Table 2.
Histopathological grading using international cartilage repair society (ICRS) histological score.
| Variables | Scores |
|---|---|
| Surface | |
| Smooth/continuous | 3 |
| Discontinuous/irregular | 0 |
| Matrix | |
| Hyaline | 3 |
| Mixture: hyaline+fibrocartilage | 2 |
| Fibrocartilage | 1 |
| Fibrous tissue | 0 |
| Cell distribution | |
| Columnar | 3 |
| Mixture/columnar cluster | 2 |
| Cluster | 1 |
| Individual cell/disorganized | 0 |
| Cell population variability | |
| Predominantly viable | 3 |
| Partially viable | 1 |
| <10% viable | 0 |
| Subchondral bone | |
| Normal | 3 |
| Increase remodeling | 2 |
| Bone necrosis/granulation tissue | 1 |
| Detached/fracture/cell at base | 0 |
| Cartilage mineralization | |
| Normal | 3 |
| Abnormal/inappropriate location | 0 |