Table 2.
Comparison of Single-Leg Drop Landing Results Between the CAI and Non-CAI Limbs a
| CAI Limbs (n = 59) |
Non-CAI Limbs (n = 147) |
P | ES | |
|---|---|---|---|---|
| TTS of horizontal GRF, s | 0.17 ± 0.13 | 0.08 ± 0.11 | <.001 b | 0.827 |
| Trajectory length of COP (m) | ||||
| 20 ms to 5 s | 3.57 ± 4.97 | 2.24 ± 1.34 | .004 b | 0.467 |
| 20 ms to 1 s | 2.71 ± 5.00 | 1.38 ± 1.32 | .004 b | 0.472 |
| 1-2 s | 0.30 ± 0.07 | 0.28 ± 0.07 | .252 | 0.175 |
| 2-3 s | 0.21 ± 0.05 | 0.21 ± 0.05 | .351 | 0.163 |
| 3-4 s | 0.18 ± 0.05 | 0.19 ± 0.04 | .561 | 0.107 |
| 4-5 s | 0.17 ± 0.05 | 0.17 ± 0.04 | .718 | 0.041 |
| Vertical peak GRF, N/kg | 39.37 ± 8.49 | 47.07 ± 13.37 | <.001 b | 0.629 |
| Time to peak vertical GRF, s | 0.06 ± 0.02 | 0.05 ± 0.02 | .024 b | 0.362 |
| Horizontal peak GRF, N/kg | 4.02 ± 1.34 | 6.52 ± 3.58 | <.001 b | 0.799 |
| Time to peak horizontal GRF, s | 0.06 ± 0.02 | 0.06 ± 0.02 | .279 | 0.173 |
| Sagittal peak GRF, N/kg | 5.66 ± 2.39 | 6.96 ± 2.32 | .001 b | 0.556 |
| Time to peak sagittal GRF, s | 0.07 ± 0.03 | 0.06 ± 0.02 | .032 b | 0.345 |
a Data are presented as mean ± SD. CAI, chronic ankle instability; COP, center of pressure; ES, effect size (Cohen d); GRF, ground-reaction force; TTS, time to stabilization after landing.
b Significant difference between groups (P < .05).