|
| Characteristic | | Score |
|
| % hyaline cartilage | 80–100 | 8 |
| 60–80 | 6 |
| 40-60 | 4 |
| 20-40 | 2 |
| 0-20 | 0 |
| Structural characteristics | | |
| Surface irregularity | Smooth and intact | 2 |
| Fissures | 1 |
| Severe disruption, fibrillation | 0 |
| Structural integrity | Normal | 2 |
| Slight disruption, including cysts | 1 |
| Severe lack of integration | 0 |
| Thickness | 100% of normal adjacent cartilage | 2 |
| 50% to 100% or thicker than normal | 1 |
| 0–50% | 0 |
| Bonding to adjacent cartilage | Bonded at both ends of graft | 2 |
| Bonded at one end/partially both ends | 1 |
| Not bonded | 0 |
| Freedom from cellular changes of degeneration | Normal cellularity, no clusters | 2 |
| Slight hypocellularity, <25% chondrocyte clusters | 1 |
| Moderate hypocellularity, >25% clusters | 0 |
| Freedom from degenerate changes in adjacent cartilage | Normal cellularity, no clusters, normal staining | 3 |
| Normal cellularity, mild clusters, moderate staining | 2 |
| Mild or moderate hypocellularity, slight staining | 1 |
| Severe hypocellularity, slight staining | 0 |
| Reconstitution of subchondral bone | Complete reconstitution | 2 |
| Greater than 50% reconstruction | 1 |
| 50% or less reconstruction | 0 |
| Bonding of repair cartilage to de novo subchondral bone | Complete and uninterrupted | 2 |
| <100% but >50% reconstruction | 1 |
| <50% complete | 0 |
| Safranin O staining | >80% homogeneous positive stain | 2 |
| 40%–80% homogeneous positive stain | 1 |
| <40% homogeneous positive stain | 0 |
| Total score | Max 27 |
|
