Table 3.
Comparison of Patients With and Without ACL Injurya
| ACL Injury (n = 450) | No ACL Injury (n = 267) | P | |
|---|---|---|---|
| Age, y | 14.9 ± 2.2 | 13.5 ± 2.7 | <.001 |
| Sex (female) | 237 (52.7) | 147 (55.1) | .535 |
| Playing sport during injury | 404 (89.8) | 222 (83.1) | .010 |
| Noncontact | 9 (2.2) | 37 (16.7) | <.001 |
| Limited contact | 30 (7.4) | 33 (14.9) | |
| Contact or collision | 365 (90.3) | 152 (68.5) | |
| First-degree relatives with ACL tears | 113 (25.1) | 32 (12.0) | <.001 |
| Age of youngest first-degree relative with ACL tears, yb | 21.7 ± 8.6 | 27.8 ± 12.4 | .019 |
| Sport played by first-degree relative with ACL tearsc | .399 | ||
| Noncontact | 2 (2.1) | 1 (5.3) | |
| Limited contact | 20 (21.1) | 5 (26.3) | |
| High contact | 73 (76.8) | 13 (68.4) |
aStatistics reported as either mean ± SD or n (%). For the group that did not suffer an ACL injury (controls), the sport played during injury reflects the sport played at the time that they suffered a concussion. Additionally, sport played at the time of injury for first-degree relatives was only available for 96 and 19 patients in the case and control groups, respectively. ACL, anterior cruciate ligament.
bMann-Whitney U test.
cFisher exact test.