Scottish Rite for Children, Frisco, TX 75034, USA.
Department of Orthopaedic Surgery, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.
Sensors (Basel). 2023 Sep 20;23(18):7987. doi: 10.3390/s23187987.
Wearable inertial measurement units (IMUs) can be utilized as an alternative to optical motion capture as a method of measuring joint angles. These sensors require functional calibration prior to data collection, known as sensor-to-segment calibration. This study aims to evaluate previously described sensor-to-segment calibration methods to measure joint angle range of motion (ROM) during highly dynamic sports-related movements. Seven calibration methods were selected to compare lower extremity ROM measured using IMUs to an optical motion capture system. The accuracy of ROM measurements for each calibration method varied across joints and sport-specific tasks, with absolute mean differences between IMU measurement and motion capture measurement ranging from <0.1° to 24.1°. Fewer significant differences were observed at the pelvis than at the hip, knee, or ankle across all tasks. For each task, one or more calibration movements demonstrated non-significant differences in ROM for at least nine out of the twelve ROM variables. These results suggest that IMUs may be a viable alternative to optical motion capture for sport-specific lower-extremity ROM measurement, although the sensor-to-segment calibration methods used should be selected based on the specific tasks and variables of interest for a given application.
可穿戴惯性测量单元 (IMU) 可用作光学运动捕捉的替代方法，以测量关节角度。这些传感器在进行数据收集之前需要进行功能校准，称为传感器到肢体的校准。本研究旨在评估先前描述的传感器到肢体校准方法，以测量在高度动态的与运动相关的运动中关节的活动范围 (ROM)。选择了七种校准方法来比较 IMU 测量的下肢 ROM 与光学运动捕捉系统。对于每个校准方法，ROM 测量的准确性因关节和特定运动任务而异，IMU 测量和运动捕捉测量之间的绝对平均差异范围从 <0.1°到 24.1°。在所有任务中，骨盆的差异比髋部、膝部或踝部小。对于每个任务，至少九个 ROM 变量中的九个 ROM 变量中，有一个或多个校准运动的 ROM 没有显著差异。这些结果表明，IMU 可能是光学运动捕捉的一种可行替代方法，用于特定于运动的下肢 ROM 测量，尽管应根据特定应用的特定任务和感兴趣的变量选择使用的传感器到肢体校准方法。
