Reliable sagittal plane kinematic gait assessments are feasible using low-cost webcam technology.
Reliable sagittal plane kinematic gait assessments are feasible using low-cost webcam technology.
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DOI：
10.1016/j.gaitpost.2017.04.030
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发表时间：
2017-07
期刊：
影响因子：
2.4
通讯作者：
Krishnan C
中科院分区：
文献类型：
--
作者：
Saner RJ;Washabaugh EP;Krishnan C
三维（3-D）运动捕捉系统通常用于步态分析，因为它们提供可靠和准确的测量。然而，这种方法的缺点是它很昂贵，需要技术专长;从而使其在临床上不太可行。为了解决这一限制，我们最近开发并验证了（使用高精度步行机器人）一种低成本，二维（2-D）实时运动跟踪方法，使用简单的网络摄像头和LabVIEW视觉助手。本研究的目的是建立使用该系统记录的髋关节和膝关节矢状面步态运动学的可重复性和最小可检测变化值。21名健康受试者进行了两次运动学评估，同时在跑步机上以一定范围的步态速度行走。计算常用髋关节和膝关节运动学参数的组内相关系数（ICC）和最小可检测变化（MDC）值，以证明系统的可靠性。此外，生成Bland-Altman图，以检查两个不同日期记录的测量值之间的一致性。对于本研究中测试的所有步态参数，该系统表现出良好至优异的可靠性（ICC > 0.75）。对于大多数参数，MDC值通常较低（< 5°）。Bland-Altman图表明，运动学测量中没有系统误差或偏倚，并且在两个不同日期获得的测量值之间显示出良好的一致性。这些结果表明，使用网络摄像头技术的运动步态评估可以可靠地用于临床和研究目的。
Three-dimensional (3-D) motion capture systems are commonly used for gait analysis because they provide reliable and accurate measurements. However, the downside of this approach is that it is expensive and requires technical expertise; thus making it less feasible in the clinic. To address this limitation, we recently developed and validated (using a high-precision walking robot) a low-cost, two-dimensional (2-D) real-time motion tracking approach using a simple webcam and LabVIEW Vision Assistant. The purpose of this study was to establish the repeatability and minimal detectable change values of hip and knee sagittal plane gait kinematics recorded using this system. Twenty-one healthy subjects underwent two kinematic assessments while walking on a treadmill at a range of gait velocities. Intraclass correlation coefficients (ICC) and minimal detectable change (MDC) values were calculated for commonly used hip and knee kinematic parameters to demonstrate the reliability of the system. Additionally, Bland-Altman plots were generated to examine the agreement between the measurements recorded on two different days. The system demonstrated good to excellent reliability (ICC > 0.75) for all the gait parameters tested on this study. The MDC values were typically low (< 5°) for most of the parameters. The Bland-Altman plots indicated that there was no systematic error or bias in kinematic measurements and showed good agreement between measurements obtained on two different days. These results indicate that kinematic gait assessments using webcam technology can be reliably used for clinical and research purposes.
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