Table 2 Modified O’Driscoll Scoring System [36, 37]
Category | Score |
|---|---|
1. Nature of predominant tissue | |
Cellular morphology | |
Hyaline articular cartilage | 4 |
Partially differentiated mesenchyme | 2 |
Fibrous tissue or bone | 0 |
2. Structural properties | |
Surface integrity | |
Smooth and in tact | 3 |
Superficial horizontal lamination | 2 |
Fissures: 25–100% of thickness | 1 |
Significant disruption, including fibrillation | 0 |
Structural integrity | |
Normal | 2 |
Slight disruption, including cysts | 1 |
Significant disruption | 0 |
Thickness | |
100% of normal surrounding cartilage | 2 |
50–100% of normal cartilage | 1 |
0–50% of normal cartilage | 0 |
Bonding at adjacent cartilage | |
Bonded at both ends | 2 |
Bonded at one end or partially at both | 1 |
Not bonded | 0 |
3. Independence from cellular changes of degeneration | |
Hypocellularity | |
Normal cellularity | 3 |
Mild hypocellularity | 2 |
Moderate hypocellularity | 1 |
Severe hypocellularity | 0 |
Chondrocyte grouping | |
No grouping | 2 |
Less than 25% of cells | 1 |
25–100% of cells | 0 |
4. Independence from degenerative changes of adjacent cartilage | |
Cellular properties | |
Normal cellularity, no grouping | 3 |
Normal cellularity, mild grouping | 2 |
Mild or moderate hypocellularity | 1 |
Severe hypocellularity | 0 |
Fibrillation | |
No fibrillation | 3 |
Less than 25% of the thickness of cartilage | 2 |
25–50% of the thickness of cartilage | 1 |
More than 50% of the thickness of cartilage | 0 |