OKM grades at follow-ups 1–3 and latest possible follow-up
| N | OKM D (n; change) | OKM C (n; change) | OKM B (n; change) | OKM A (n; change) | |
| FU1 (3–6 months), n=65/67 (97%) | 65 | 83% (54; 0) | 6.1% (4; 0) | 7.7% (5; 0) | 3.1% (2; 0) |
| FU2 (9–18 months), n=41/67 (61.2%) | 41 | 90.2% (37; +4 from B; +2 from C) | 9.7% (4; +2 from A) | 2.4% (1; −2 to D) | 0% (0; −2 to C) |
| FU3 (>19 months), n=13/67 (19.4%) | 13 | 92.3% (12; +1 from C; +1 from A) | 7.7% (1; 0) | 0% (0; 0) | 0% (0; 0) |
| Latest possible follow-up, n=67 (100%) | 67 (100%) | 92.5% (62) | 4.5% (3) | 3% (2) | 0% (0) |
FU, follow-up; OKM, O’Kelly–Marotta scale.