Weber Carolyn F, McClinton Shane
Des Moines University, Des Moines, IA USA.
Int J Sports Phys Ther. 2020 Dec;15(6):910-919. doi: 10.26603/ijspt20200910.
Two-dimensional (2D) video analysis is a practical tool for assessing biomechanical factors that may contribute to running-related injury. Asymmetrical or altered coordination of transverse plane trunk movement has been associated with low back pain, increased vertical and horizontal ground reaction forces, and altered hip abduction torque and strength. However, the reliability and validity of 2D transverse plane upper trunk rotation (UTR) has not been assessed.
Validity and reliability study.
To determine the validity and reliability of 2D video-based, transverse plane UTR measurement during running.
Sixteen runners ran at self-selected speed on a treadmill while three-dimensional (3D) and 2D motion capture occurred synchronously. Two raters measured peak UTR for five consecutive strides on two occasions. Interrater and intrarater reliability and the minimum detectable change was calculated for right and left peak 2D UTR measurement. Concurrent validity and agreement between 2D and 3D measures were determined by calculating Pearson Product Correlation Coefficients () and Bland-Altman plots, respectively.
Using a single UTR measure per runner, intrarater and interrater reliability (ICC) was excellent (intrarater ICC range: 0.989-0.999; interrater ICC range: 0.990-0.995) and the minimum detectable change was 0.39-1.4 degrees. Measurements in 2D and 3D were significantly correlated for peak UTR (all ≥ 0.986; all value < 0.001) and showed good agreement in Bland-Altman plots.
Two-dimensional video-based measurement of transverse plane peak UTR is valid and reliable.
UTR measurement may provide clinical insight into gait deviations in the transverse plane that alter angular momentum and increase risk for running-related injury.
2B.
二维（2D）视频分析是评估可能导致跑步相关损伤的生物力学因素的实用工具。横断面躯干运动的不对称或协调性改变与腰痛、垂直和水平地面反作用力增加以及髋关节外展扭矩和力量改变有关。然而，二维横断面躯干上部旋转（UTR）的可靠性和有效性尚未得到评估。
效度和信度研究。
确定跑步过程中基于二维视频的横断面UTR测量的效度和信度。
16名跑步者在跑步机上以自选速度跑步，同时进行三维（3D）和二维运动捕捉。两名评估者两次连续测量五个步幅的UTR峰值。计算右侧和左侧二维UTR峰值测量的评估者间和评估者内信度以及最小可检测变化。二维和三维测量之间的同时效度和一致性分别通过计算Pearson积差相关系数（）和Bland-Altman图来确定。
每位跑步者采用单次UTR测量，评估者内和评估者间信度（ICC）极佳（评估者内ICC范围：0.989 - 0.999；评估者间ICC范围：0.990 - 0.995），最小可检测变化为0.39 - 1.4度。二维和三维测量的UTR峰值显著相关（所有≥0.986；所有值<0.001），并且在Bland-Altman图中显示出良好的一致性。
基于二维视频的横断面UTR峰值测量是有效且可靠的。
UTR测量可为横断面步态偏差提供临床见解，这些偏差会改变角动量并增加跑步相关损伤的风险。
2B。
