|
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 |
|