Institute of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, ON, Canada.
Bloorview Research Institute, Holland Bloorview Kids Rehabilitation Hospital, Toronto, ON, Canada.
Prosthet Orthot Int. 2020 Aug;44(4):245-262. doi: 10.1177/0309364620921290. Epub 2020 Jun 7.
Motion capture systems are widely used to quantify human gait. Two-dimensional (2D) video systems are simple to use, easily accessible, and affordable. However, their performance as compared to other systems (i.e. three-dimensional (3D) gait analysis) is not well established.
This work provides a comprehensive review of design specifications and performance characteristics (validity and reliability) of two-dimensional motion capture systems.
Systematic review.
A systematic literature search was conducted in three databases from 1990 to 2019 and identified 30 research articles that met the inclusion/exclusion criteria.
Reliability of measurements of two-dimensional video motion capture was found to vary greatly from poor to excellent. Results relating to validity were also highly variable. Comparisons between the studies were challenging due to differences in protocols, instrumentation, parameters assessed, and analyses performed.
Variability in performance could be attributed to study design, gait parameters being measured, and technical aspects. The latter includes camera specifications (i.e. resolution and frame rate), setup (i.e. camera position), and analysis software. Given the variability in performance, additional validation testing may be needed for specific applications involving clinical or research-based assessments, including specific patient populations, gait parameters, mobility tasks, and data collection protocols.
This review article provides guidance on the application of 2D video gait analysis in a clinical or research setting. While not suitable in all instances, 2D gait analysis has promise in specific applications. Recommendations are provided about the patient populations, gait parameters, mobility tasks, and data collection protocols.
运动捕捉系统广泛用于量化人体步态。二维（2D）视频系统使用简单、易于获取且价格合理。然而，其与其他系统（即三维（3D）步态分析）的性能相比尚未得到充分确立。
本文全面回顾了二维运动捕捉系统的设计规格和性能特征（有效性和可靠性）。
系统评价。
对三个数据库进行了系统的文献检索，时间跨度为 1990 年至 2019 年，共确定了 30 篇符合纳入/排除标准的研究文章。
二维视频运动捕捉测量的可靠性差异很大，从很差到很好。有效性的结果也存在很大的差异。由于协议、仪器、评估参数和分析方法的不同，研究之间的比较具有挑战性。
性能的可变性可能归因于研究设计、测量的步态参数以及技术方面。后者包括相机规格（例如分辨率和帧率）、设置（例如相机位置）和分析软件。鉴于性能的可变性，对于涉及临床或基于研究的评估的特定应用，可能需要进行额外的验证测试，包括特定的患者群体、步态参数、活动能力任务和数据采集协议。
本文回顾了二维视频步态分析在临床或研究环境中的应用。虽然在所有情况下都不适用，但二维步态分析在特定应用中具有潜力。本文就患者群体、步态参数、活动能力任务和数据采集协议提供了建议。
