Background

The altered coordination variability was related to anterior cruciate ligament (ACL) re-injury after ACL reconstruction (ACL-R). As motor performance is affected by the cognitive loading, understanding the interaction of cognition and coordination variability is crucial for addressing secondary injury prevention and restoring function in rehabilitation programs.

Research Question

To investigate the lower extremity movement coordination variability asymmetry in individuals following ACL-R and determine the effects of cognitive loading on the coordination variability.

Methods

Twenty-five males who received unilateral ACL-R using hamstring tendon autograft (7.4 ± 1.3 months past reconstruction). Participants performed walking without (single-task condition) and with the concurrent cognitive task (dual-task condition). The coordination variability in hip-knee coupled motion in different gait phases was calculated using vector coding technique.

Results

The injured leg demonstrated greater coordination variability in hip flexion/knee flexion (HF/KF) during mid-stance phase (P = 0.012) than the uninjured leg in both conditions. No significant differences were observed in other phases of HF/KF variability or other measures in all phases between the injured and uninjured legs. Both legs increased the HF/KF coordination variability during loading response phase in dual-task condition than that in single-task condition (P < 0.001).

Significance

Individuals following ACL-R demonstrated coordination variability asymmetry of sagittal plane hip-knee coupled motion. The dual cognitive task increased the coordination variability of hip flexion/knee flexion during loading response phase in individuals following ACL-R.

中文翻译：

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认知负荷对前交叉韧带重建患者下肢运动协调变异性的影响

背景

协调变异性的改变与ACL重建（ACL-R）后前十字韧带（ACL）再损伤有关。由于运动表现受认知负荷的影响，因此了解认知与协调变异的相互作用对于解决康复计划中的继发性伤害预防和恢复功能至关重要。

研究问题

为了研究ACL-R后个体的下肢运动协调变异性的不对称性，并确定认知负荷对协调变异性的影响。

方法

25名使用who绳肌腱自体移植接受单侧ACL-R的男性（重建后7.4±1.3个月）。参与者在没有（单任务条件）和有并发认知任务（双任务条件）的情况下进行步行。使用矢量编码技术计算了不同步态阶段的髋膝耦合运动的协调变异性。

结果

在两种情况下，中位阶段（P = 0.012），受伤的腿在髋屈/膝屈（HF / KF）方面的协调变异性均大于未受伤的腿。在受伤和未受伤的双腿之间，其他阶段的HF / KF变异性其他阶段或其他测量均未观察到显着差异。与单任务条件相比，双任务条件下加载响应阶段的双腿均增加了HF / KF协调变异性（P <0.001）。

意义

遵循ACL-R的个体表现出矢状平面髋膝关节运动的协调变异性不对称性。双重认知任务增加了在ACL-R之后的负荷反应阶段髋部屈曲/膝部屈曲的协调变异性。