Nobuhara Hospital and Institute of Biomechanics, Tatsunoshi, Hyogo, Japan.
Acta Orthop. 2009 Aug;80(4):451-5. doi: 10.3109/17453670903171867.
Knowledge about the pattern of rotation during arm elevation is necessary for a full understanding of shoulder function, and it is also useful for planning of rehabilitation protocols to restore range of motion in shoulders in disorder. However, there are insufficient in vivo data available. METHODS; We investigated dynamic arm rotation during elevation in different planes using 30 shoulders in 15 healthy men (age range 21-33 years). Both arms were moved from neutral dependent position to maximum elevated position in 4 planes from laterally to anteriorly, and each dynamic course of motion was traced using a 3-dimensional motion capture system.
Patterns of rotation were categorized as being one of 2 types, depending on whether or not external rotation peaked before the arm reached the maximum elevated position. External rotation peaked at 122 degrees (SD14) of abduction, then decreased according to the arm movement in the lateral planes, but increased gradually to maximum elevated position in the anterior planes. Mean maximal angles of external rotation (in degrees) during elevation were 27 (SD11), 13 (SD13), 3 (SD9), and 3 (SD5), from laterally to anteriorly.
There were differences in rotational patterns, and more external rotation was needed to reach maximum elevation in lateral planes than in anterior planes.
充分了解手臂抬高过程中的旋转模式对于全面了解肩部功能至关重要，对于制定恢复肩部运动范围的康复方案也很有用，因为肩部可能存在功能障碍。然而，目前体内可用的数据还不够充分。
我们研究了 15 名健康男性（年龄 21-33 岁）的 30 个肩膀在不同平面上的动态手臂旋转。双臂从中立依赖位置向最大抬高位置在四个平面上从外侧向内侧移动，每个动态运动轨迹都使用三维运动捕捉系统进行跟踪。
根据手臂是否在达到最大抬高位置之前先达到外旋峰值，旋转模式可分为两种类型。外旋在 122 度（标准差 14）的外展时达到峰值，然后根据手臂在外侧平面上的运动而减小，但在前侧平面上逐渐增加到最大抬高位置。在抬高过程中外旋的最大角度（以度为单位）平均为 27（标准差 11）、13（标准差 13）、3（标准差 9）和 3（标准差 5），从外侧到前侧。
旋转模式存在差异，并且在外侧平面上达到最大抬高位置需要更多的外旋。
