双任务单腿跳跃表现揭示前交叉韧带重建术后持续性不对称和运动缺陷：一项随机交叉实验研究
简介
该研究纳入15例ACL重建术后患者与16例健康对照，采用随机交叉设计，比较单任务与双任务（跳跃同时完成视空间工作记忆任务）下单腿跳远表现、落地质量及肢体对称性。结果显示，双任务条件下ACL重建组肢体对称指数（LSI）的双任务成本显著高于对照组（p<0.001），而跳跃距离和落地质量的双任务成本组间差异不显著。提示双任务范式可暴露ACL重建术后患者持续存在的肢…
英文摘要
BACKGROUND: Dual-task paradigms are increasingly used to investigate cognitive-motor interactions after anterior cruciate ligament reconstruction (ACLR), yet their effects on hop performance, movement quality and limb symmetry remain insufficiently quantified. The objective of this study was to compare these outcomes under single- and dual-task conditions between individuals after ACLR and healthy controls. METHODS: Thirty-one participants (15 ACLR and 16 healthy controls) were included in this multicentre randomised repeated-measures experimental study. Participants performed the single-leg hop for distance (SLHD) under single-task and dual-task conditions using counterbalanced sequences. Movement quality was assessed using the Qualitative Assessment of Single-Leg Landing Scale (QASLS). In the dual-task condition, participants performed the hop while simultaneously completing a standardised visuo-attentional working-memory task. Dual-task cost (DTC) was calculated for SLHD, QASLS and limb symmetry index (LSI). The primary outcome was SLHD DTC. Analyses were based on linear mixed-effect models, with sequence-specific findings reported descriptively to support transparency regarding the counterbalanced design. RESULTS: Under dual-task conditions, SLHD DTC was numerically higher in the ACLR group than in controls in sequences A1 (6.5 ± 6.5% vs 2.7 ± 6.9%; p = 0.227) and A2 (1.1 ± 1.1% vs -0.7 ± 6.8%; p = 0.316), although these between-group differences were not statistically significant. QASLS DTC was not significantly greater in the ACLR group in sequence A1 (0.19 ± 0.23 vs 0.12 ± 0.36 points; p = 0.385) or A2 (0.43 ± 0.28 vs 0.56 ± 0.87 points; p = 0.613). The largest between-group differences were observed for LSI DTC, which was significantly higher in the ACLR group in sequences A1 (3.8 ± 1.9% vs 0.7 ± 1.3%; p < 0.001) and A2 (6.5 ± 2.4% vs 0.6 ± 1.2%; p < 0.001). Repeated-condition sequences B1 and B2 were retained to explore potential order, learning and fatigue effects and were not interpreted as DTC sequences. Sequence-specific descriptive findings in the ACLR group showed dual-task-related effects for limb symmetry in A1 and A2, whereas controls showed minimal changes. CONCLUSION: Dual-task conditions were associated with measurable changes in SLHD performance, movement quality and limb symmetry after ACLR. Trail Registration: Clinical trial.gov.identifier: NCT06768957.