Department of Physical Medicine and Rehabilitation, The University of Minnesota, Program in Physical Therapy, Mayo Mail Code 388, 420 Delaware Street, Minneapolis, MN 55455, USA.
J Biomech. 2011 Feb 24;44(4):700-5. doi: 10.1016/j.jbiomech.2010.10.042. Epub 2010 Dec 24.
Glenohumeral motion presents challenges for its accurate description across all available ranges of motion using conventional Euler/Cardan angle sequences without singularity. A comparison of the description of glenohumeral motion was made using the ISB recommended YX'Y″ sequence to the XZ'Y″ sequence. A direct in-vivo method was used for the analysis of dynamic concentric glenohumeral joint motion in the scapular plane. An electromagnetic tracking system collected data from ten healthy individuals while raising their arm. There were differences in the description of angular position data between the two different sequences. The YX'Y″ sequence described the humerus to be in a more anteriorly rotated and externally rotated position compared to XZ'Y″ sequence, especially, at lower elevation angles. The description of motion between increments using XZ'Y″ sequence displacement decomposition was comparable to helical angles in magnitude and direction for the study of arm elevation in the scapular plane. The description of the direction or path of motion of the plane of elevation using YX'Y″ angle decomposition would be contrary to that obtained using helical angles. We recommend that this alternate sequence (XZ'Y″) should be considered for describing glenohumeral motion.
在不出现奇点的情况下，使用传统的欧拉/卡丹角序列，全范围运动的描述对肩胛平面上动态同心盂肱关节运动进行分析，使用电磁跟踪系统从十个健康个体的数据，当他们抬起手臂时收集数据。两种不同序列之间的角位置数据的描述存在差异。与 XZ'Y″序列相比，YX'Y″序列描述肱骨处于更向前旋转和外旋的位置，尤其是在较低的抬高角度。使用 XZ'Y″序列位移分解描述增量之间的运动与在肩胛平面上进行手臂抬高的螺旋角在大小和方向上相当。使用 YX'Y″角度分解描述平面运动的方向或路径将与使用螺旋角获得的结果相反。我们建议应考虑使用此替代序列（XZ'Y″）来描述盂肱关节运动。
