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Shoulder Joint Angle Errors Caused by Marker Offset

机译：标记偏移引起的肩关节角误差

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The International Society of Biomechanics (ISB) has recommended a standardization of the definition of the joint coordinate system (JCS) and use of a sequential rotation to describe human shoulder joint rotation. Markers attached to the surface of the body may move during the process of motion data capture, resulting in an offset from their initial location. This leads to a change of the JCS and therefore affects the calculated shoulder joint angles. In this research study, we presented a simple marker offset model to quantify the shoulder joint errors for both static poses and dynamic activities. Specific conditions of different offsets and elbow flexion angles were studied. Results showed that the errors should not be neglected when the shoulder elevation angle was near-90° and 90°, or elbow flexion was very small. Attention should be paid to these errors for such activities especially walking and throwing.
机译：国际生物力学协会（ISB）建议标准化联合坐标系（JCS）的定义，以及使用顺序旋转来描述人肩关节旋转。附着于主体表面的标记可以在运动数据捕获过程中移动，从而导致偏移偏置位置。这导致JCS的变化，因此影响计算的肩关节角。在这项研究中，我们介绍了一个简单的标记偏移模型，以量化静态姿势和动态活动的肩关节误差。研究了不同偏移和肘部屈曲角度的具体条件。结果表明，当肩部仰角接近-90°和90°时，误差不应忽略误差，或者肘部屈曲非常小。应注意这些误差，特别是遵守和投掷。

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