Table 2.
Defect characteristics based on MRI and intraoperative findings
| Defect locationa | n (%) |
| Retropatellar | 19 (55.9) |
| Medial FC | 5 (14.7) |
| Lateral FC | 5 (14.7) |
| Medial + lateral FC | 1 (2.9) |
| Medial FC + retropatellar | 1 (2.9) |
| Lateral FC + retropatellar | 1 (2.9) |
| Trochlear groove | 1 (2.9) |
| Tibial | 1 (2.9) |
| Appearance on MRI | |
| Defect size | |
| ≤ 1cm2 | 4 (12.9) |
| > 1cm2 ≤ 2cm2 | 17 (54.8) |
| > 2cm2 ≤ 4cm2 | 6 (19.4) |
| > 4cm2 ≤ 6cm2 | 4 (12.9) |
| ≥ 6cm2 | 0 (0) |
| Chondral defect | |
| (a) Signal alteration | 2 (6.5) |
| (b) Partial-thickness defect | 17 (54.8) |
| (c) Full-thickness defect | 12 (38.7) |
| Intraoperative appearance | |
| Defect size | |
| ≤ 1cm2 | 3 (8.8) |
| > 1cm2 ≤ 2cm2 | 7 (20.4) |
| > 2cm2 ≤ 4cm2 | 12 (35.2) |
| > 4cm2 ≤ 6cm2 | 8 (23.5) |
| ≥ 6cm2 | 4 (11.7) |
| ICRS grading | |
| Grade 1 | 0 (0) |
| Grade 2 | 0 (0) |
| Grade 3 | 19 (61.3) |
| Grade 4 | 12 (38.7) |
Data displayed as number (per cent)
FC femoral Condyle, ICRS International Cartilage Repair Society, MRI magnetic resonance imaging
aMultiple locations possible