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The single-leg vertical hop provides unique asymmetry information in individuals after anterior cruciate ligament reconstruction.
Clinical Biomechanics ( IF 1.8 ) Pub Date : 2020-07-16 , DOI: 10.1016/j.clinbiomech.2020.105107
Jeffrey B Taylor 1 , Audrey E Westbrook 2 , Penny L Head 3 , Katie M Glover 3 , Max R Paquette 4 , Kevin R Ford 2
Affiliation  

Background

Traditional testing to identify asymmetries after anterior cruciate ligament reconstruction include four similar horizontal hopping tests. The purpose of this study was to determine whether a single-leg vertical hopping test can identify performance and biomechanical asymmetries, and whether performance asymmetries provide unique information compared to traditional tests.

Methods

Twelve women with history of anterior cruciate ligament reconstruction [age: 21.1 years (SD 3.2), height: 165.8 cm (SD 6.0), mass: 68.3 kg (SD 8.8)] completed traditional horizontal hop testing. Participants also performed a single-leg vertical hop for maximal height while instrumented for three-dimensional motion analysis. Paired t-tests were performed to identify side-to-side differences in performance variables and Spearman's rank correlations were performed of limb symmetry indices to identify whether the single-leg vertical hop test provides unique information. Repeated measures MANOVAs were performed to identify single-leg vertical hop biomechanical asymmetries.

Findings

Participants exhibited significant side-to-side performance differences during the single-leg vertical hop [mean difference = 0.02 m (SD 0.03), P = .04]. Only weak to moderate relationships were identified between limb symmetry indices of the single-leg vertical hop and other horizontal hopping tests. The vertical hop elicited significant asymmetries of joint kinematics (P = .04) and angular impulse (P = .04). Specifically, the involved limb showed lower peak ankle dorsiflexion (P = .004) and knee abduction (P = .02) angles, lower sagittal plane impulse at the knee (P = .02) and greater sagittal plane impulse at the hip (P = .03).

Interpretation

The single-leg vertical hop can identify performance and biomechanical asymmetries in individuals after anterior cruciate ligament reconstruction, potentially providing complementary information to standard horizontal hopping tests.



中文翻译:

前交叉韧带重建后,单腿垂直跃点可为个体提供独特的不对称信息。

背景

在前交叉韧带重建后识别不对称性的传统测试包括四个类似的水平跳跃测试。这项研究的目的是确定单腿垂直跳动测试是否可以识别性能和生物力学不对称性,以及与传统测试相比,性能不对称性是否可以提供独特的信息。

方法

十二名具有前交叉韧带重建史的妇女[年龄:21.1岁(SD 3.2),身高:165.8 cm(SD 6.0),质量:68.3 kg(SD 8.8)]完成了传统的水平跃点测试。参与者还进行了单向垂直跳,以最大身高进行三维运动分析。进行配对的t检验以识别性能变量的左右差异,并以肢体对称性指标进行Spearman等级相关性以鉴定单腿垂直跳试验是否提供了独特的信息。进行重复测量MANOVA,以识别单腿垂直跃点生物力学不对称性。

发现

参与者在单腿垂直跳过程中表现出明显的左右性能差异[平均差异= 0.02 m(SD 0.03),P  = .04]。在单腿垂直跳和其他水平跳跳测试的肢体对称性指标之间仅识别出弱到中等的关系。垂直跳动引起关节运动学(P  = .04)和角冲量(P  = .04)的显着不对称。具体而言,受累肢体显示出较低的峰值踝背屈(P  = .004)和膝盖外展(P  = .02)角度,膝盖处的矢状面冲动较低(P  = .02),髋部的矢状面冲动较大(P  = .03)。

解释

单腿垂直跳可以在前交叉韧带重建后识别个体的性能和生物力学不对称性,从而可能为标准水平跳动测试提供补充信息。

更新日期:2020-07-25
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