Table 4.
ICRS gross grading scale
| Feature | Score | No. 1 | No. 2 | No. 3 | Mean ± SE | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| R | L | R | L | R | L | R | L | |||
| Coverage | > 75% fill | 4 | 3 | 2 | 2 | 2 | 1 | 1 | 2.0 ± 0.6 | 1.7 ± 0.3 |
| 50–75% fill | 3 | |||||||||
| 25–50% fill | 2 | |||||||||
| < 25% full | 1 | |||||||||
| No fill | 0 | |||||||||
| Neocartilage colour | Normal | 4 | 3 | 2 | 1 | 1 | 1 | 1 | 1.7 ± 0.7 | 1.3 ± 0.3 |
| 25% yellow/brown | 3 | |||||||||
| 50% yellow/brown | 2 | |||||||||
| 75% yellow/brown | 1 | |||||||||
| 100%yellow/brown | 0 | |||||||||
| Defect margins | Invisible | 4 | 3 | 2 | 2 | 2 | 1 | 1 | 2.0 ± 0.6 | 1.7 ± 0.3 |
| 25% circumference visible | 3 | |||||||||
| 50% circumference visible | 2 | |||||||||
| 75% circumference visible | 1 | |||||||||
| Entire circumference visible | 0 | |||||||||
| Surface | Smooth/level with normal | 4 | 1 | 1 | 1 | 1 | 0 | 1 | 0.7 ± 0.3 | 1.0 ± 0.0 |
| Smooth but raised | 3 | |||||||||
| Irregular 25–50% | 2 | |||||||||
| Irregular 50–75% | 1 | |||||||||
| Irregular > 75% | 0 | |||||||||
| Average (0–4) | 2.5 | 1.8 | 1.5 | 1.5 | 0.8 | 1.0 | 1.6 ± 0.5 | 1.4 ± 0.2 | ||
R, Right hindlimb; L, left hindlimb; ICRS, International Cartilage Repair Society