Background

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.

Research question

What is the test-retest reliability of peak KAM, KAM impulse, and KAM loading rate measurements during walking in knee-healthy individuals?

Methods

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.

Results

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 MDC₉₅ (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.

Significance

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.

中文翻译：

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步行过程中膝盖内收力矩峰值，冲动和负荷率的重测信度和变异性。

背景

先前的研究报告了步行过程中峰值膝关节内收力矩（KAM）的良好重测信度。但是，尚未确定其他KAM测量的可靠性。

研究问题

膝盖健康个体在行走过程中峰值KAM，KAM冲量和KAM负荷率测量的重测可靠性如何？

方法

在此测试-再测试可靠性研究中，分析了来自32位膝盖健康参与者的数据。报告了两次会议的各种KAM测量结果，以及从与力板同步的运动捕捉系统获得的运动学和动力学数据，两次会议之间的中位数为1周。

结果

对于所有KAM度量，类内相关系数均高于0.90，其下限95％置信度上限超过0.81。但是，不同测量的绝对测量差异是不同的，标准化的SEM（8％–15％），标准化的MDC ₉₅（20％–40％），会话内MAD（10％–18％）和会话间MAD（12 ％–22％）在2倍范围内变化。KAM的总体峰值和第一个峰值，超过50％的姿态的KAM脉冲以及KAM加载速率（15帧窗口）分别表示会话期间和会话间MAD≤10％和≤15％。

意义

这项研究为步行过程中的各种KAM措施提供了以前不确定的重测可靠性估计。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。