Wang Ziqi, Chen Hao, Yue Lei, Zhang Jianming, Sun Haolin
Department of Orthopedic, Peking University First Hospital, China.
Department of Rehabilitation Medicine, Peking University First Hospital, China.
Heliyon. 2025 Feb 12;11(4):e42597. doi: 10.1016/j.heliyon.2025.e42597. eCollection 2025 Feb 28.
Gait analysis is widely utilized for the diagnosis and prognosis of various diseases. Recently, innovative convenient markerless motion capture systems have been developed to replace the traditional marker-based three-dimensional motion capture systems.
s:This study is to evaluate the test-retest reliability of a novel video-based markerless motion capture system(Watrix, China) and to assess its concordance with a three-dimensional motion analysis system (BTS, Italy) in a population of young healthy subjects.
Our study included 36 healthy adult participants. Each subject underwent three assessments using Watrix system and BTS system. To evaluate the validity and reliability of the measurements, we employed paired-sample t-tests, Wilcoxon signed-rank tests, intra-class correlation coefficients, Bland-Altman analysis and Passing Bablok regression analysis.
Both intra-rater and inter-rater reliability demonstrated moderate to excellent correlations, with intraclass correlation coefficient (ICC) values ranging from 0.507 to 0.936, except for cadence(ICC = 0.233). The validity exhibited a good correlation for sagittal plane parameters(ICC ranging from 0.818 to 0.883) and a moderate correlation for the coronal and transverse parameters (ICC ranging from 0.520 to 0.608). The Passing Bablok linear regression analysis indicated that the confidence intervals for the intercepts of all parameters included 0, while the confidence intervals for the slopes of most parameters encompassed 1 except for step width, pelvic obliquity, and hip adduction-abduction angle. The implementation of Watrix system significantly decreased the testing duration for participants.
The Watrix system demonstrated relatively high test-retest reliability. The Watrix and BTS systems demonstrated moderate to good agreement for most parameters. However, the Watrix system tended to underestimate coronal and transverse plane parameters, resulting in lower consistency. In addition, the markerless motion capture system greatly reduces the testing duration.Optimizing algorithms to improve recognition accuracy remains the main direction of research.
步态分析广泛应用于各种疾病的诊断和预后评估。近年来，已开发出创新的便捷无标记运动捕捉系统，以取代传统的基于标记的三维运动捕捉系统。
本研究旨在评估一种新型基于视频的无标记运动捕捉系统（中国的华锐视创）的重测信度，并在年轻健康受试者群体中评估其与三维运动分析系统（意大利的BTS）的一致性。
我们的研究纳入了36名健康成年参与者。每位受试者使用华锐视创系统和BTS系统进行了三次评估。为评估测量的有效性和可靠性，我们采用了配对样本t检验、Wilcoxon符号秩检验、组内相关系数、Bland-Altman分析和Passing Bablok回归分析。
评分者内和评分者间信度均显示出中度到高度的相关性，组内相关系数（ICC）值范围为0.507至0.936，但步频除外（ICC = 0.233）。矢状面参数的有效性表现出良好的相关性（ICC范围为0.818至0.883），冠状面和横断面参数的相关性为中度（ICC范围为0.520至0.608）。Passing Bablok线性回归分析表明，所有参数截距的置信区间包含0，而除步宽、骨盆倾斜度和髋关节内收-外展角度外，大多数参数斜率的置信区间包含1。华锐视创系统的使用显著缩短了参与者的测试时间。
华锐视创系统显示出相对较高的重测信度。华锐视创系统和BTS系统在大多数参数上显示出中度到良好的一致性。然而，华锐视创系统倾向于低估冠状面和横断面参数，导致一致性较低。此外，无标记运动捕捉系统大大缩短了测试时间。优化算法以提高识别准确性仍是主要研究方向。
