Table 5 Assessment of cartilage lesion grade of patellofemoral joint according to ICRS grade system at second-look operation compared with the initial operation
|  | Group 1 (n = 59) | Group 2 (n = 33) | P value b |
|---|---|---|---|
Preoperative a | Â | Â | 0.000 |
 CRS grade 0 | 0 (0.0%) | 20 (60.6%) |  |
 ICRS grade 1 | 0 (0.0%) | 13 (39.4%) |  |
 ICRS grade 2 | 12 (20.3%) | 0 (0.0%) |  |
 ICRS grade 3 | 47 (79.7%) | 0 (0.0%) |  |
Postoperative (Second-Look) a | Â | Â | 0.000 |
 ICRS grade 0 | 0 (0.0%) | 16 (48.5%) |  |
 ICRS grade 1 | 1 (1.7%) | 7 (21.2%) |  |
 ICRS grade 2 | 5 (8.5%) | 5 (15.2%) |  |
 ICRS grade 3 | 51 (86.4%) | 5 (15.2%) |  |
 ICRS grade 4 | 2 (3.4%) | 0 (0.0%) |  |
P value c | 0.071 | 0.007 | Â |