Department of Physiotherapy, Singapore General Hospital, Singapore.
La Trobe Sport and Exercise Medicine Research Centre, La Trobe University, Victoria, Australia.
Gait Posture. 2020 Jul;80:113-116. doi: 10.1016/j.gaitpost.2020.05.029. Epub 2020 May 23.
Previous studies have reported good test-retest reliability for peak knee adduction moment (KAM) during walking. However, reliability of other KAM measurements has not been established.
What is the test-retest reliability of peak KAM, KAM impulse, and KAM loading rate measurements during walking in knee-healthy individuals?
Data from 32 knee-healthy participants were analysed in this test-retest reliability study. Various KAM measurements were reported for two sessions with kinematic and kinetic data obtained from a motion capture system synchronised with force plates, with a median of 1 week between sessions.
For all KAM measures, intra-class correlation coefficients were above 0.90 and their lower bound 95 % confidence limits exceeded 0.81. However, absolute measurement variability differed across measures, with normalized SEM (8 %-15 %), normalized MDC (20 %-40 %), intra-session MAD (10 %-18 %), and inter-session MAD (12 %-22 %) varying over a 2-fold range. Overall and first peak KAM, KAM impulse over 50 % stance, and KAM loading rate (15 frame window) showed ≤10 % and ≤15 % intra- and inter-session MAD, respectively.
This study provided previously undefined test-retest reliability estimates for various KAM measures during walking. Researchers and clinicians should not assume that the various aspects of the KAM curve share similar reliability.
先前的研究报告称，在行走过程中，峰值膝关节内收力矩（KAM）的测试-重测信度良好。然而，其他 KAM 测量的可靠性尚未确定。
在膝关节健康的个体中，行走过程中峰值 KAM、KAM 冲量和 KAM 加载率测量的测试-重测信度如何？
本研究对 32 名膝关节健康的参与者进行了测试-重测可靠性分析。使用运动捕捉系统和力板同步获取的运动学和动力学数据，对两个测试阶段进行了各种 KAM 测量，两次测试之间的中位数时间为 1 周。
对于所有 KAM 测量值，组内相关系数均高于 0.90，其下限 95%置信区间超过 0.81。然而，各测量值的绝对测量变异性不同，标准化 SEM（8%-15%）、标准化 MDC（20%-40%）、单次测试内的 MAD（10%-18%）和两次测试间的 MAD（12%-22%）差异在两倍范围内。整体和首次峰值 KAM、50%站立阶段内的 KAM 冲量以及 KAM 加载率（15 帧窗口）的内、外测试 MAD 分别≤10%和≤15%。
本研究为行走过程中各种 KAM 测量的测试-重测信度提供了之前未定义的估计值。研究人员和临床医生不应假设 KAM 曲线的各个方面具有相似的可靠性。
