Cescon Corrado, Barbero Marco, Conti Marco, Bozzetti Francesco, Lewis Jeremy
Rehabilitation Research Laboratory 2rLab, Department of Business Economics, Health and Social Care, University of Applied Sciences and Arts of Southern Switzerland, Manno, Switzerland.
MedSport Sports Medicine, Como, Italy.
Int Biomech. 2019 Dec;6(1):1-8. doi: 10.1080/23335432.2019.1597642.
Information pertaining to the helical axis during humeral kinematics during shoulder rotation may be of benefit to better understand conditions such as shoulder instability. The aim of this study is to quantify the behavior of humeral rotations using helical axis (HA) parameters in three different conditions. A total of 19 people without shoulder symptoms participated in the experiment. Shoulder kinematics was measured with an optoelectric motion capture system. The subjects performed three different full range rotations of the shoulder. The shoulder movements were analyzed with the HA technique. Four parameters were extracted from the HA of the shoulder during three different full-range rotations: range of movement (RoM), mean angle (MA), axis dispersion (MDD), and distance of their center from the shoulder (D). No significant differences were observed in the RoM for each condition between left and right side. The MA of the axis was significantly lower on the right side compared to the left in each of the three conditions. The MDD was also lower for the right side compared to the left side in each of the three conditions.The four parameters proposed for the analysis of shoulder kinematics showed to be promising indicators of shoulder instability.
有关肩部旋转过程中肱骨运动学期间螺旋轴的信息可能有助于更好地理解肩部不稳定等情况。本研究的目的是在三种不同条件下使用螺旋轴（HA）参数量化肱骨旋转的行为。共有19名无肩部症状的人参与了实验。使用光电运动捕捉系统测量肩部运动学。受试者进行了三种不同的肩部全范围旋转。使用HA技术分析肩部运动。在三种不同的全范围旋转过程中，从肩部的HA中提取了四个参数：运动范围（RoM）、平均角度（MA）、轴离散度（MDD）以及它们的中心与肩部的距离（D）。在每种条件下，左右两侧的RoM均未观察到显著差异。在三种条件中的每一种条件下，右侧轴的MA均显著低于左侧。在三种条件中的每一种条件下，右侧的MDD也低于左侧。所提出的用于分析肩部运动学的四个参数显示出是肩部不稳定的有前景的指标。
