Intramuscular increased signal intensity and fibrosis on MRI at return to play (RTP) of participants without reinjury compared to participants with reinjury within 2 months after RTP
| No reinjury (n=48) | Reinjury (n=5) | |||
|---|---|---|---|---|
| Increased signal intensity present | 43/48 | 90% | 4/5 | 80% |
| Extent of increased signal intensity | ||||
| Median longitudinal length (minimum–maximum) | 73 mm | 0–220 | 65 mm | 0–94 |
| Median involved cross sectional muscle area (minimum–maximum) | 8% | 0–90 | 14% | 0–31 |
| Intramuscular fibrosis present | 18/48 | 38% | 4/5 | 80% |
| Extent of fibrosis | ||||
| Median longitudinal length (minimum–maximum) | 88 mm | 8–190 | 48 mm | 15–130 |
| Median length on axial view (minimum–maximum) | 9.4 mm | 3.3–20.1 | 5.7 mm | 2.8–22.9 |
| Median width on axial view (minimum–maximum) | 4.9 mm | 2.1–10.1 | 3.1 mm | 1.5–20.6 |
MRI, magnetic resonance imaging; RTP, return to play.