Palaeontological Institute and Museum, University of Zurich, Zurich, Switzerland.
Structure and Motion Laboratory, Royal Veterinary College, London, UK.
J Anat. 2022 Oct;241(4):1054-1065. doi: 10.1111/joa.13717. Epub 2022 Jul 12.
Quantifying joint range of motion (RoM), the reachable poses at a joint, has many applications in research and clinical care. Joint RoM measurements can be used to investigate the link between form and function in extant and extinct animals, to diagnose musculoskeletal disorders and injuries or monitor rehabilitation progress. However, it is difficult to visually demonstrate how the rotations of the joint axes interact to produce joint positions. Here, we introduce the spherical frame projection (SFP), which is a novel 3D visualisation technique, paired with a complementary data collection approach. SFP visualisations are intuitive to interpret in relation to the joint anatomy because they 'trace' the motion of the coordinate system of the distal bone at a joint relative to the proximal bone. Furthermore, SFP visualisations incorporate the interactions of degrees of freedom, which is imperative to capture the full joint RoM. For the collection of such joint RoM data, we designed a rig using conventional motion capture systems, including live audio-visual feedback on torques and sampled poses. Thus, we propose that our visualisation and data collection approach can be adapted for wide use in the study of joint function.
量化关节活动范围（ROM），即关节可达到的姿势，在研究和临床护理中有许多应用。关节 ROM 测量可用于研究现存和已灭绝动物的形态与功能之间的联系，诊断肌肉骨骼疾病和损伤，或监测康复进展。然而，很难直观地展示关节轴的旋转如何相互作用以产生关节位置。在这里，我们介绍了球形框架投影（SFP），这是一种新颖的 3D 可视化技术，与补充的数据收集方法相结合。SFP 可视化与关节解剖结构相关，因为它们“追踪”了关节处远端骨骼相对于近端骨骼的坐标系的运动，因此易于解释。此外，SFP 可视化包含自由度的相互作用，这对于捕获完整的关节 ROM 至关重要。为了收集这种关节 ROM 数据，我们使用传统的运动捕捉系统设计了一个装置，包括关于扭矩和采样姿势的实时音频-视觉反馈。因此，我们提出我们的可视化和数据收集方法可以适应于广泛研究关节功能。
