Schurr Stacy A, Marshall Ashley N, Resch Jacob E, Saliba Susan A
Exercise and Sport Injury Laboratory, University of Virginia, Charlottesville, VA, USA.
Int J Sports Phys Ther. 2017 Apr;12(2):163-172.
Although 3D motion capture is considered the "gold standard" for recording and analyzing kinematics, 2D video analysis may be a more reasonable, inexpensive, and portable option for kinematic assessment during pre-participation screenings. Few studies have compared quantitative measurements of lower extremity functional tasks between 2D and 3D.
To compare kinematic measurements of the trunk and lower extremity in the frontal and sagittal planes between 2D video camera and 3D motion capture analyses obtained concurrently during a SLS.
Descriptive laboratory study.
Twenty-six healthy, recreationally active adults volunteered to participate. Participants performed three trials of the single leg squat on each limb, which were recorded simultaneously by three 2D video cameras and a 3D motion capture system. Dependent variables analyzed were joint displacement at the trunk, hip, knee, and ankle in the frontal and sagittal planes during the task compared to single leg quiet standing.
Dependent variables exhibited moderate to strong correlations between the two measures in the sagittal plane ( = 0.51-.093), and a poor correlation at the knee in the frontal plane ( = 0.308) at ( ≤ 0.05) All other dependent variables revealed non-significant results between the two measures. Bland-Altman plots revealed strong agreement in the average mean difference in the amount of joint displacement between 2D and 3D in the sagittal plane (trunk = 1.68 º, hip = 2.60 º, knee = 0.74 º, and ankle = 3.12 º). Agreement in the frontal plane was good (trunk = 7.92 °, hip = -8.72 º, knee = -6.62 º, and ankle = 3.03 °).
Moderate to strong relationships were observed between 2D video camera and 3D motion capture analyses at all joints in the sagittal plane, and the average mean difference was comparable to the standard error of measure with goniometry. The results suggest that despite the lack of precision and ability to capture rotations, 2D measurements may provide a pragmatic method of evaluating sagittal plane joint displacement for assessing gross movement displacement and therein risk of lower extremity injury.
尽管三维运动捕捉被认为是记录和分析运动学的“金标准”，但二维视频分析对于参与前筛查期间的运动学评估而言，可能是一种更合理、廉价且便携的选择。很少有研究比较二维和三维下肢功能任务的定量测量结果。
比较在单腿深蹲（SLS）期间同时获得的二维摄像机和三维运动捕捉分析在额状面和矢状面中躯干和下肢的运动学测量结果。
描述性实验室研究。
26名健康、有休闲运动习惯的成年人自愿参与。参与者每条腿进行三次单腿深蹲试验，由三台二维摄像机和一个三维运动捕捉系统同时记录。分析的因变量是任务期间与单腿静立相比，躯干、髋、膝和踝关节在额状面和矢状面的关节位移。
在矢状面中，两种测量方法的因变量呈现出中度到高度的相关性（r = 0.51 - 0.93），而在额状面中，膝关节处的相关性较差（r = 0.308）（p≤0.05）。所有其他因变量在两种测量方法之间均显示无显著差异。布兰德 - 奥特曼图显示，在矢状面中二维和三维之间关节位移量的平均差值具有高度一致性（躯干 = 1.68°，髋 = 2.60°，膝 = 0.74°，踝 = 3.12°）。在额状面中的一致性良好（躯干 = 7.92°，髋 = -8.72°，膝 = -6.62°，踝 = 3.03°）。
在矢状面中，二维摄像机和三维运动捕捉分析在所有关节处均观察到中度到高度的相关性，并且平均差值与测角法的测量标准误差相当。结果表明，尽管二维测量缺乏精度且无法捕捉旋转，但它可能为评估矢状面关节位移以评估总体运动位移及其中下肢损伤风险提供一种实用方法。
3级。
