Department of Systems and Computer Engineering, Faculty of Engineering and Design, Carleton University, 1125 Colonel By Drive, Ottawa, Ontario K1S 5B6, Canada; Ottawa-Carleton Institute for Biomedical Engineering, Ottawa, Ontario, Canada.
Department of Systems and Computer Engineering, Faculty of Engineering and Design, Carleton University, 1125 Colonel By Drive, Ottawa, Ontario K1S 5B6, Canada; School of Human Kinetics, Faculty of Health Sciences, University of Ottawa, 200 Lees Avenue, Ottawa, Ontario K1N 6N5, Canada; Ottawa-Carleton Institute for Biomedical Engineering, Ottawa, Ontario, Canada.
J Biomech. 2024 Feb;164:111939. doi: 10.1016/j.jbiomech.2024.111939. Epub 2024 Jan 9.
Inertial measurement units (IMUs) offer a portable and inexpensive alternative to traditional optical motion capture systems, and have potential to support clinical diagnosis and treatment of low back pain; however, due to a lack of confidence regarding the validity of IMU-derived metrics, their uptake and acceptance remain a challenge. The objective of this work was to assess the concurrent validity of the Xsens DOT IMUs for tracking multiplanar spine movement, and to evaluate concurrent validity and reliability for estimating clinically relevant metrics relative to gold-standard optical motion capture equipment. Ten healthy controls performed spine range of motion (ROM) tasks, while data were simultaneously tracked from IMUs and optical marker clusters placed over the C7, T12, and S1 vertebrae. Root mean square error (RMSE), mean absolute error (MAE), and intraclass correlation coefficients (ICC) were calculated to assess validity and reliability of absolute (abs; C7, T12, and S1 sensors) and relative joint (rel; intersegmental thoracic, lumbar, and total) motion. Overall RMSE = 1.33°, MAE = 0.74° ± 0.69, and ICC = 0.953 across all movements, sensors, and planes. Results were slightly better for uniplanar movements when evaluating the primary rotation axis (prim) absolute ROM (MAE = 0.56° ± 0.49; ICC = 0.999). Similarly, when evaluating relative intersegmental motion, overall RMSE = 2.39°, MAE = 1.10° ± 0.96, and ICC = 0.950, and relative primary rotation axis achieved MAE = 0.87° ± 0.77, and ICC = 0.994. Findings from this study suggest that these IMUs can be considered valid for tracking multiplanar spine movement, and may be used to objectively assess spine movement and neuromuscular control in clinics.
惯性测量单元（IMU）为传统的光学运动捕捉系统提供了一种便携且经济的替代方案，并且有可能支持腰痛的临床诊断和治疗；然而，由于对 IMU 衍生指标的有效性缺乏信心，它们的采用和接受仍然是一个挑战。本研究的目的是评估 Xsens DOT IMU 跟踪多平面脊柱运动的同时效度，并评估与金标准光学运动捕捉设备相比，估计临床相关指标的同时效度和可靠性。10 名健康对照者进行了脊柱活动范围（ROM）任务，同时从 IMU 和放置在 C7、T12 和 S1 椎骨上的光学标记簇跟踪数据。计算均方根误差（RMSE）、平均绝对误差（MAE）和组内相关系数（ICC），以评估绝对（abs；C7、T12 和 S1 传感器）和相对关节（rel；节段间胸、腰和总）运动的有效性和可靠性。所有运动、传感器和平面的 RMSE 平均值为 1.33°，MAE 平均值为 0.74°±0.69，ICC 平均值为 0.953。在评估主要旋转轴（prim）绝对 ROM 时，单平面运动的结果略好（MAE 平均值为 0.56°±0.49；ICC 平均值为 0.999）。同样，在评估相对节段间运动时，RMSE 平均值为 2.39°，MAE 平均值为 1.10°±0.96，ICC 平均值为 0.950，相对主要旋转轴的 MAE 平均值为 0.87°±0.77，ICC 平均值为 0.994。本研究的结果表明，这些 IMU 可以被认为是跟踪多平面脊柱运动的有效方法，并且可以用于在诊所中客观地评估脊柱运动和神经肌肉控制。
