Table 2.
Comparison of Knee Biomechanics and Cutting Technique Variables Between Players With and Without a Previous ACL Injury (n = 744 for angles and approach speed; n = 702 for joint moments) a
| Variable | Previous ACL Injury, Ipsilateral Leg (n = 64) | No Previous ACL Injury, Random Leg (n = 679) | P | MD (95% CI) | Previous ACL Injury, Contralateral Leg (n = 65) | No Previous ACL Injury, Random Leg (n = 679) | P | MD (95% CI) |
|---|---|---|---|---|---|---|---|---|
| Knee flexion angle at IC, deg | 25.1 ± 8.3 | 24.3 ± 7.9 | .310 | 0.9 (–0.8 to 2.5) | 25.3 ± 8.9 | 24.0 ± 7.6 | .121 | 1.3 (–0.3 to 2.9) |
| Knee flexion angle peak, deg | 62.4 ± 7.1 | 62.7 ± 6.7 | .743 | 0.3 (–1.5 to 2.0) | 63.7 ± 6.5 | 62.9 ± 6.7 | .335 | 0.8 (–0.9 to 2.6) |
| Knee abduction angle at IC, deg | 3.4 ± 4.4 | 4.8 ± 4.3 | .016 | 1.4 b (0.3 to 2.5) | 4.6 ± 4.2 | 4.8 ± 4.3 | .634 | 0.3 (–0.8 to 1.4) |
| Knee abduction angle peak, deg | 9.3 ± 5.2 | 10.8 ± 5.2 | .028 | 1.5 b (0.2 to 2.9) | 10.2 ± 4.9 | 11.0 ± 5.1 | .207 | 0.8 (–0.5 to 2.2) |
| Knee flexion moment peak, N·m/kg-1 | 2.56 ± 0.62 | 2.89 ± 0.58 | <.001 | 0.33 b (0.18 to 0.48) | 2.87 ± 0.71 | 2.89 ± 0.59 | .818 | 0.02 (–0.14 to 0.18) |
| Knee abduction moment peak, N·m/kg-1 | 1.40 ± 0.50 | 1.67 ± 0.55 | <.001 | 0.27 b (0.12 to 0.41) | 1.59 ± 0.52 | 1.67 ± 0.54 | .266 | 0.08 (–0.06 to 0.23) |
| Knee internal rotation moment peak, N·m/kg-1 | 0.18 ± 0.19 | 0.24 ± 0.21 | .031 | 0.06 b (0.01 to 0.12) | 0.29 ± 0.26 | 0.23 ± 0.20 | .056 | 0.06 (–0.00 to 0.11) |
| Approach speed at IC, m·s-1 | 2.96 ± 0.43 | 3.11 ± 0.50 | .004 | 0.16 b (0.05 to 0.26) | 3.06 ± 0.47 | 3.11 ± 0.50 | .327 | 0.05 (–0.05 to 0.16) |
a
Values are expressed as mean ± SD unless otherwise noted. ACL, anterior cruciate ligament; IC, initial contact; MD, mean difference.
b
Significant mean difference (P≤ .05).