## 3 Results
### Ankle Joint Angles of the Two Groups  
At the IC of drop landing, an interaction effect of group \(\times\) cognition was observed in the ankle joint plantar flexion angle (\(p=0.040\)), with simple effects, showing that, under the baseline conditions, the FAI group's unstable side showed a smaller plantarflexion angle compared to the control group's matched side (\(p=0.008\)); under a cognitive influence, the FAI group's unstable side showed a larger plantarflexion angle compared to the baseline (\(p=0.005\)) (Table 4). \begin{table}
\begin{tabular}{l c c c c c} \hline \hline \multicolumn{1}{c}{**Variable**} & \multicolumn{1}{c}{**FAI Group**} & \multicolumn{1}{c}{**Control Group**} & \multicolumn{1}{c}{**Main Effect**} & \multicolumn{1}{c}{**Interaction Effect**} \\ \multicolumn{1}{c}{**Affected Side**} & \multicolumn{1}{c}{**Matched Side**} & \multicolumn{1}{c}{**Group**} & \multicolumn{1}{c}{**Cognition**} & \multicolumn{1}{c}{**Group \(\times\) Cognition**} \\ \hline IC & & & & & \\ Hip Flexion/Extension Angle (\({}^{\circ}\)) & & & & & \\ Baseline & \(19.96\pm 5.28\) & \(23.63\pm 7.44\) & \(p=0.157\) & \(p=0.701\) & \(p=0.622\) \\ Cognitive Influence & \(20.07\pm 5.55\) & \(22.72\pm 7.71\) & \(F=2.118\) & \(F=0.151\) & \(F=0.249\) \\ Hip Adduction/Abduction Angle (\({}^{\circ}\)) & & & & \\ Baseline & \(-5.17\pm 2.75\) & \(-5.14\pm 5.10\) & \(p=0.886\) & \(p=0.733\) & \(p=0.863\) \\ Cognitive Influence & \(-5.33\pm 3.21\) & \(-5.64\pm 3.38\) & \(F=0.021\) & \(F=0.119\) & \(F=0.030\) \\ Peak vGRF Moment & & & & \\ Hip Flexion/Extension Angle (\({}^{\circ}\)) & & & & \\ Baseline & \(23.25\pm 6.56\) & \(27.06\pm 7.47\) & \(p=0.255\) & \(p=0.341\) & \(p=0.444\) \\ Cognitive Influence & \(23.02\pm 6.20\) & \(24.99\pm 9.57\) & \(F=1.348\) & \(F=0.937\) & \(F=0.604\) \\ Cognitive Influence & \(23.02\pm 6.20\) & \(24.99\pm 9.57\) & \(Ett^{2}=0.046\) & \(Ett^{2}=0.032\) & \(Ett^{2}=0.021\) \\ Hip Adduction/Abduction Angle (\({}^{\circ}\)) & & & & \\ Baseline & \(-4.01\pm 3.05\) & \(-4.30\pm 5.37\) & \(p=0.937\) & \(p=0.968\) & \(p=0.837\) \\ Cognitive Influence & \(-4.17\pm 3.32\) & \(-4.07\pm 4.14\) & \(Ett^{2}=0.006\) & \(F=0.002\) & \(F=0.043\) \\ \hline \end{tabular} Note: Hip flexion (+)/extension (\(-\)), hip addiction (+)/abduction (\(-\)).  
\end{table} 
Table 2: Hip joint angle at IC and peak vGRF moments during drop landing. \begin{table}
\begin{tabular}{l c c c c c} \hline \hline \multicolumn{1}{c}{**Variable**} & \multicolumn{1}{c}{**FAI Group**} & \multicolumn{1}{c}{**Control Group**} & \multicolumn{1}{c}{**Main Effect**} & \multicolumn{1}{c}{**Interaction Effect**} \\ \multicolumn{1}{c}{**Affected Side**} & \multicolumn{1}{c}{**Matched Side**} & \multicolumn{1}{c}{**Group**} & \multicolumn{1}{c}{**Cognition**} & \multicolumn{1}{c}{**Group \(\times\) Cognition**} \\ \hline IC & & & & & \\ Knee Flexion/Extension Angle (\({}^{\circ}\)) & & & & & \\ Baseline & \(9.72\pm 4.11\) & \(6.58\pm 3.93\) & \(p=0.002\)\({}^{\star}\) & \(p=0.680\) & \(p=0.996\) \\ Cognitive Influence & \(9.36\pm 3.38\) & \(6.21\pm 2.25\) & \(F=11.301\) & \(F=0.173\) & \(F<0.001\) \\ Knee Varus/Valgus Angle (\({}^{\circ}\)) & & & & \\ Baseline & \(-5.17\pm 2.75\) & \(-5.14\pm 5.10\) & \(p=0.886\) & \(p=0.733\) & \(p=0.863\) \\ Cognitive Influence & \(-5.33\pm 3.21\) & \(-5.64\pm 3.38\) & \(F=0.021\) & \(F=0.119\) & \(F=0.030\) \\ Peak vGRF Moment & & & & \\ Knee flexion/Extension Angle (\({}^{\circ}\)) & & & & \\ Baseline & \(23.25\pm 6.56\) & \(27.06\pm 7.47\) & \(p=0.255\) & \(p=0.341\) & \(p=0.444\) \\ Cognitive Influence & \(23.02\pm 6.20\) & \(24.99\pm 9.57\) & \(Ett^{2}=0.046\) & \(Ett^{2}=0.032\) & \(Ett^{2}=0.021\) \\ Knee Varus/Valgus Angle (\({}^{\circ}\)) & & & & \\ Baseline & \(-0.48\pm 3.95\) & \(1.50\pm 2.38\) & \(p=0.027\)\({}^{\star}\) & \(p=0.845\) & \(p=0.983\) \\ Cognitive Influence & \(-0.62\pm 3.52\) & \(1.32\pm 2.73\) & \(Ett^{2}=0.163\) & \(Ett^{2}=0.001\) & \(Ett^{2}<0.001\) \\ \hline \end{tabular} Note: Knee flexion (+)/extension (\(-\)), knee varus (+)/valgus (\(-\)); \({}^{\star}\); \(p<0.05\).  
\end{table}