Background

Emerging research has suggested a plausible relationship may exist between lower limb coordination and musculoskeletal injury. A small number of studies have investigated the link between coordination and anterior cruciate ligament (ACL) injury during sidestep cutting. While prior work has shown unanticipated sidestep cutting to exhibit a more ‘at risk’ kinematic profile compared to anticipated tasks, a detailed understanding of the coordination between multiple joints and how they differ during unanticipated actions is lacking, particularly in females.

Research question

The purpose of this study was to observe the difference in trunk, pelvis and lower limb coordination and coordination variability during a dynamic, sidestep cutting task under anticipated and unanticipated conditions in a healthy female cohort.

Methods

Three-dimensional motion analysis data were recorded during anticipated and unanticipated sidestep cutting for nineteen healthy female participants (age, 24 ± 3yrs; height, 164 ± 5 cm; and weight, 58 ± 6 kg). Vector coding methodology was used to calculate coordination and coordination variability values and statistical parametric and non-parametric mapping was used to comprehensively determine differences between anticipated and unanticipated conditions.

Results

Differences were observed between anticipated and unanticipated conditions in the hip flexion – knee abduction angle (89 % of stance), hip rotation – knee abduction angle (55 % of stance), knee flexion – knee abduction angle (81–83 %, 86 % and 88–89 %) and knee flexion – ankle flexion angle (14–18 %) coupling angles. Differences in coupling angle variability were also observed with only one cluster of significance seen in hip abduction – knee abduction variability (27–30 % of stance).

Significance

Healthy females exhibit significant differences in lower limb coupling angles and coupling angle variability between anticipated and unanticipated sidestep cutting. Interventions aimed at reducing ACL injury risk may need to consider that anticipated and unanticipated sidestep cutting tasks present unique demands, and therefore should both be trained specifically.

中文翻译：

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女性预期和未预期的侧步切割之间的躯干，骨盆和下肢协调

背景

新兴的研究表明，下肢协调性与肌肉骨骼损伤之间可能存在合理的关系。少数研究调查了在进行侧切时协调性与前交叉韧带（ACL）损伤之间的联系。尽管先前的工作已经表明，与预期的任务相比，意外的切开运动表现出更高的“危险”运动学特征，但仍缺乏对多个关节之间的协调以及在意外动作期间它们之间的区别的详细了解，尤其是在女性中。

研究问题

这项研究的目的是在健康女性队列中，在预期的和意外的条件下，动态，分步切割任务期间观察躯干，骨盆和下肢协调性以及协调变异性的差异。

方法

在19位健康女性参与者（年龄24±3岁；身高164±5 cm；体重58±6 kg）的预期和未预期的跨步切割过程中记录了三维运动分析数据。使用矢量编码方法来计算协调和协调变异性值，并使用统计参数和非参数映射来全面确定预期条件与意外条件之间的差异。

结果

在髋部屈曲–膝关节外展角（占姿态的89％），髋关节旋转–膝关节外展角（占姿态的55％），膝关节屈曲–膝关节外展角（81–83％，86％）的预期和未预期情况之间观察到差异和88–89％）和膝盖屈曲–踝关节屈曲角（14–18％）的耦合角。在髋关节外展中仅观察到一组重要的意义，即膝关节外展变异性（27％至30％的立场），也观察到了耦合角度变异性的差异。

意义

健康的女性在下肢结合角度和预期和未预期的跨步切割之间的结合角度变异性上表现出显着差异。旨在减少ACL伤害风险的干预措施可能需要考虑到预期和意外的切边切割任务提出了独特的要求，因此都应进行专门培训。