Department of Biomedical Engineering, Cleveland Clinic, Cleveland, OH 44195, United States.
Gait Posture. 2012 Jul;36(3):643-5. doi: 10.1016/j.gaitpost.2012.04.012. Epub 2012 May 23.
Kinematic analysis of the digits using optical motion capture systems relies on defining accurate coordinate systems for the individual segments. Limitations of previous digit kinematic protocols include marker placement errors, marker occlusion and superimposition, and skin movement artifact. The purpose of this study was to develop a protocol utilizing a digit alignment device (DAD) and nail marker clusters to overcome these limitations. Ten subjects underwent 10 static calibration trials for validation. The orientation of the thumb distal phalange relative to the index finger distal phalange was described using Euler angles of pitch(x), yaw(y'), and roll(z''). The digit calibration protocol demonstrated high accuracy (0.5°, 1.9° and 2.2° for x, y', z'') and precision (1.4°, 2.3° and 3.1° for x, y', z''). The developed protocol provided convenient identification of transformations that determine anatomically relevant coordinate systems for the distal phalanges of the digits. The potential of utilizing this protocol as a standardized tool for digit kinematics was demonstrated using a dynamic task of precision pinching.
使用光学运动捕捉系统对数字进行运动学分析依赖于为各个部分定义准确的坐标系。先前的数字运动学协议的局限性包括标记放置误差、标记遮挡和叠加以及皮肤运动伪影。本研究的目的是开发一种利用数字对准装置 (DAD) 和指甲标记簇来克服这些限制的协议。十名受试者进行了 10 次静态校准试验以进行验证。拇指远节相对于食指远节的方向用俯仰角 (x)、偏航角 (y') 和滚转角 (z'') 描述。数字校准协议显示出高精度（x、y'、z' 分别为 0.5°、1.9°和 2.2°）和高精确度（x、y'、z' 分别为 1.4°、2.3°和 3.1°）。所开发的协议提供了方便的方法，可以确定用于数字远节的解剖相关坐标系的变换。通过精确捏夹的动态任务展示了将该协议用作数字运动学标准化工具的潜力。
