Croci Eleonora, Künzel Christoph, Gehring Dominic, Müller Andreas Marc, Mündermann Annegret
Department of Biomedical Engineering, University of Basel, Basel, Switzerland; Department of Orthopaedics and Traumatology, University Hospital Basel, Basel, Switzerland.
Department of Biomedical Engineering, University of Basel, Basel, Switzerland; Department of Sport and Sport Science, University of Freiburg, Freiburg, Germany.
J Biomech. 2025 Oct;191:112905. doi: 10.1016/j.jbiomech.2025.112905. Epub 2025 Aug 11.
While markerless motion capture system has recently gained interest, little is known on the accuracy of Theia 3D for measuring shoulder kinematics. This study aimed to compare shoulder kinematics across the full range of arm motion between Theia 3D and a gold standard marker-based motion capture system. Shoulder kinematics of 20 healthy subjects were measured during three repetitions of bilateral full arm scaption, abduction, flexion, internal rotation, external rotation, and internal and external rotation at 90° abduction. Data were simultaneously collected with Theia 3D (v2024.1.24) markerless and marker-based motion capture. Markerless and marker-based angular trajectories had similar patterns, with larger differences towards the inflection point of the movements and with the markerless trajectories having mostly greater values than marker-based trajectories. Root mean square differences were smallest for abduction angles (<6°) and largest for the external rotation angles (15.3°-22.3°). Coefficients of multiple correlations (CMCs) were mostly good to excellent (>0.75), but CMC was moderate (0.65-0.75) for flexion angles during rotation at 90° and weak (<0.65) for flexion angles during external rotation. For almost all tasks, the ranges of motion differed significantly between the two measurement systems in all three planes. However, mean differences in the coronal plane and in the sagittal plane were within the minimal clinically important differences. We found moderate to very strong correlations between the range of motion parameters of the two measurement methods. The assessment of shoulder kinematics with Theia 3D is promising but further improvements are needed for clinical routine application.
虽然无标记运动捕捉系统最近受到了关注，但对于Theia 3D测量肩部运动学的准确性知之甚少。本研究旨在比较Theia 3D与基于标记的金标准运动捕捉系统在全臂运动范围内的肩部运动学。在20名健康受试者进行双侧全臂前屈上举、外展、前屈、内旋、外旋以及90°外展时的内旋和外旋的三次重复动作过程中，测量其肩部运动学。使用Theia 3D（v2024.1.24）无标记和基于标记的运动捕捉同时收集数据。无标记和基于标记的角轨迹具有相似的模式，在运动的拐点处差异较大，且无标记轨迹的值大多大于基于标记的轨迹。均方根差异在外展角度时最小（<6°），在外旋角度时最大（15.3° - 22.3°）。多重相关系数（CMCs）大多良好到优秀（>0.75），但在90°旋转时的前屈角度CMCs为中等（0.65 - 0.75），在外旋时的前屈角度CMCs较弱（<0.65）。对于几乎所有任务，两个测量系统在所有三个平面上的运动范围均存在显著差异。然而，冠状面和矢状面的平均差异在最小临床重要差异范围内。我们发现两种测量方法的运动范围参数之间存在中度到非常强的相关性。使用Theia 3D评估肩部运动学是有前景的，但在临床常规应用中还需要进一步改进。
