Correspondence between scapular anatomical coordinate systems and the 3D axis of motion: A new perspective on an old challenge.
Correspondence between scapular anatomical coordinate systems and the 3D axis of motion: A new perspective on an old challenge.
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DOI：
10.1016/j.jbiomech.2022.111385
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发表时间：
2022-12
影响因子：
2.4
通讯作者：
Bey, Michael J
中科院分区：
文献类型：
--
作者：
Lawrence, Rebekah L;Roseni, Kevin;Bey, Michael J
文献中报道了几种肩胛骨解剖坐标系来描述肩部运动学。不幸的是，使用不同的约定阻碍了研究之间的比较。此外，坐标系和肩胛骨的 3D 运动轴之间的不一致意味着肩胛骨运动将被错误地归因于其不旋转的轴。本研究的目的是：1) 确定四种常见肩胛坐标系约定的轴与肩胛运动 3D 轴（即瞬时螺旋轴，IHA）的对应程度，2) 报告每种约定的肩胸万向节锁定的患病率。使用双平面视频射线照相术跟踪 45 名参与者肩胛平面外展期间的肩部运动学。使用 van der Helm 提出的原始惯例、国际生物力学学会 (ISB) 推荐的惯例、基于关节盂的坐标系和面向关节盂的坐标系来描述肩胛胸廓运动学。计算 IHA 和四个约定的每个轴之间的 3D 角度（IHA 轴角度偏差）。使用重复测量方差分析来比较惯例之间的 IHA 轴角度偏差。关节盂导向和 ISB 惯例分别导致最小和最大的 IHA 轴角度偏差（21.7°3.6° 与 30.5°±5.2°，p<0.01）。使用原始惯例时，有 17.8% 的参与者接近万向节锁，使用 ISB 惯例时，有 2.2% 的参与者接近万向节锁，使用基于关节盂或面向关节的惯例时，有 0% 的参与者接近万向节锁。这些发现表明，在研究肩胛平面外展期间的肩部运动学时，关节盂导向的坐标系可能值得进一步考虑。
Several scapular anatomical coordinate systems have been reported in the literature to describe shoulder kinematics. Unfortunately, the use of different conventions hinders comparison across studies. Further, inconsistencies between a coordinate system and the scapula’s 3D axis of motion means that scapular motion will be incorrectly attributed to axes about which it did not rotate. The objectives of this study were to: 1) determine the extent to which the axes of four common scapular coordinate system conventions correspond to the 3D axis of scapular motion (i.e., instantaneous helical axis, IHA), and 2) report the prevalence of scapulothoracic gimbal lock for each convention. Shoulder kinematics were tracked during scapular plane abduction in 45 participants using biplane videoradiography. Scapulothoracic kinematics were described using the original convention proposed by van der Helm, the convention recommended by the International Society of Biomechanics (ISB), a glenoid-based coordinate system, and a glenoid-oriented coordinate system. The 3D angle was calculated between the IHA and each axis of the four conventions (IHA-axis angular deviations). Repeated measures ANOVAs were used to compare IHA-axis angular deviations between conventions. The glenoid-oriented and ISB conventions resulted in the smallest and largest IHA-axis angular deviations, respectively (21.7°3.6° vs. 30.5°±5.2°, p<0.01). Gimbal lock was approached in 17.8% of participants when using the original convention, 2.2% when using the ISB convention, and 0% when using the glenoid-based or -oriented conventions. These findings suggest the glenoid-oriented coordinate system may be worthy of further consideration when investigating shoulder kinematics during scapular plane abduction.