J Sport Rehabil. 2021 Jan 27;30(5):737-743. doi: 10.1123/jsr.2020-0287.
Individuals following anterior cruciate ligament reconstruction (ACLR) demonstrate altered postural stability and functional movement patterns. It is hypothesized that individuals following ACLR may compensate with sensory adaptations with greater reliance on visual mechanisms during activities. It is unknown if visual compensatory strategies are implemented to maintain postural stability during functional tasks.
To examine visual gaze accuracy during a single-leg balance task in individuals following ACLR compared with healthy, active controls.
Case control.
Controlled laboratory.
A total of 20 individuals (10 ACLR and 10 healthy controls) participated in the study.
Visual gaze patterns were obtained during 20-second single-leg balance trials while participants were instructed to look at presented targets. During the Stationary Target Task, the visual target was presented in a central location for the duration of the trial. The Moving Target Task included a visual target that randomly moved to 1 of 9 target locations for a period of 2 seconds. Targets were stratified into superior, middle, and inferior levels for the Moving Target Task.
The Stationary Target Task demonstrated no differences in visual error between groups (P = .89). The Moving Target Task demonstrated a significant interaction between group and target level (F2,36 = 3.76, P = .033). Individuals following ACLR demonstrated greater visual error for the superior targets (ACLR = .70 [.44] m, healthy = .41 [.21] m, Cohen d = 0.83 [0.06 to 1.60]) and inferior targets (ACLR = .68 [.25] m, healthy = .33 [.16] m, Cohen d = 1.67 [0.81 to 2.52]).
Individuals following ACLR demonstrate greater visual error during settings of high or low visual stimuli compared with healthy individuals to maintain single-limb postural stability. This population may rely on visual input to compensate for the somatosensory changes following injury.
前交叉韧带重建（ACL）后，个体表现出姿势稳定性和功能性运动模式的改变。据推测，ACL 后患者可能通过感觉适应来代偿，在活动中更依赖视觉机制。目前尚不清楚是否会实施视觉代偿策略来维持功能性任务中的姿势稳定性。
与健康活跃的对照组相比，检查 ACL 后个体在单腿平衡任务中视觉注视的准确性。
病例对照。
受控实验室。
共有 20 名参与者（10 名 ACLR 和 10 名健康对照组）参与了这项研究。
在 20 秒单腿平衡试验期间，获得了视觉注视模式，同时要求参与者注视呈现的目标。在固定目标任务中，视觉目标在整个试验期间呈现于中央位置。在移动目标任务中，视觉目标随机移动到 9 个目标位置中的 1 个，持续 2 秒。目标分为上、中、下 3 个水平，用于移动目标任务。
在固定目标任务中，两组之间的视觉误差无差异（P =.89）。在移动目标任务中，组间和目标水平间存在显著交互作用（F2,36 = 3.76，P =.033）。ACL 后个体的上目标（ACLR =.70 [.44] m，健康 =.41 [.21] m，Cohen d = 0.83 [0.06 至 1.60]）和下目标（ACLR =.68 [.25] m，健康 =.33 [.16] m，Cohen d = 1.67 [0.81 至 2.52]）的视觉误差更大。
与健康个体相比，ACL 后个体在高或低视觉刺激环境中表现出更大的视觉误差，以维持单腿姿势稳定性。该人群可能依赖视觉输入来代偿受伤后的本体感觉变化。
