Background

The purpose of this study was to analyze sagittal-plane knee biomechanics in individuals with ACL reconstructions in bilateral countermovement jumps. This aimed to determine potential knee compensation strategies during a high-demanding symmetrical movement task from pre to six months post-ACL reconstruction.

Methods

20 ACL-reconstructed individuals were tested pre-operatively, and then seven weeks, three months, and six months after reconstruction. Additionally, a matched control group was analyzed. Data were sampled with 3D motion capture and two force plates. The following kinematic data were analyzed: peak knee flexion during countermovement, knee angle at toe-off, and knee flexion excursion during landing. The following kinetic data were analyzed: peak knee extension moments during countermovement and landing.

Findings

ACL-reconstructed individuals showed significant increases in knee flexion during countermovement and knee flexion excursion during landing from six weeks to six months after reconstruction but they remained significantly below the level of the controls. The reconstructed knee joint showed increased flexion at toe-off compared to the non-injured leg at all test sessions. Knee extension moments during countermovement increased up to six months after reconstruction, but remained deficient in ACL-reconstructed individuals during countermovement and landing compared to the controls.

Interpretation

Although ACL-reconstructed individuals showed increases in most kinematic and kinetic variables, they remained below the controls at six months post-ACL reconstruction. The deficits between contralateral legs and compared to the controls show that six months post-ACL reconstruction, knee joint functionality was still not equal between reconstructed and non-injured legs or in comparison to controls.

中文翻译：

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前交叉韧带重建后双侧跳跃的膝关节生物力学不足。

背景

本研究的目的是分析双侧反跳中具有ACL重建者的矢状面膝关节生物力学。目的在于确定从ACL重建前到重建后六个月的高要求的对称运动任务中潜在的膝盖补偿策略。

方法

术前对20例经ACL重建的个体进行了测试，然后在重建后7周，3个月和6个月进行了测试。另外，分析了匹配的对照组。使用3D运动捕捉和两个测力板对数据进行采样。分析了以下运动学数据：反向运动过程中的最大膝盖屈曲，脚趾离开时的膝盖角度和着陆过程中的膝盖屈曲偏移。分析了以下动力学数据：反向运动和着陆期间的最大膝盖伸展力矩。

发现

ACL重建的个体在重建后的六周到六个月内，在反运动期间的膝盖屈曲和着陆期间的膝盖屈曲偏移显着增加，但仍显着低于对照水平。在所有测试阶段，与未受伤的腿相比，重建的膝关节在脚趾处的屈曲增加。抵抗运动期间的膝盖伸展力矩在重建后最多增加了六个月，但与对照相比，抵抗运动和着陆期间经过ACL重建的个体仍然不足。

解释

尽管ACL重建的个体显示出大多数运动学和动力学变量的增加，但在ACL重建后的六个月，他们仍低于对照组。对侧双腿之间的缺陷与对照组相比显示，ACL重建后六个月，在重建和未受伤的双腿之间或与对照组相比，膝关节功能仍不相同。