Takagi S
Department of Orthopaedic Surgery, Nagasaki University School of Medicine, Japan.
Nihon Seikeigeka Gakkai Zasshi. 1988 Nov;62(11):965-76.
The arm rotation during abduction of the shoulder in the scapular plane was investigated in 11 volunteers. The degree and direction of the arm rotation were measured using five potentiometers, and were analysed by a computer system. In eight volunteers, the arm always rotated externally (1.5 degrees-4.9 degrees of rotation for each 10 degrees of abduction); in one volunteer it rotated internally (0.9 degree of rotation for each 10 degrees of abduction); and in the two remaining volunteers it rotated without showing a constant tendency during the abduction. The degree of arm rotation was correlated to the tilting angle of the acromial articular surface which was measured radiographically. A tendency of external rotation of the arm is suggested to occur during abduction in the scapular plane along with the decrease of the tilting angle of the acromial articular surface.
对11名志愿者进行了肩胛骨平面内肩部外展时手臂旋转情况的研究。使用五个电位计测量手臂旋转的程度和方向，并通过计算机系统进行分析。在8名志愿者中，手臂始终向外旋转（每外展10度旋转1.5度至4.9度）；在1名志愿者中，手臂向内旋转（每外展10度旋转0.9度）；在其余2名志愿者中，手臂在整个外展过程中旋转且无恒定趋势。手臂旋转程度与通过X线测量的肩峰关节面倾斜角度相关。提示在肩胛骨平面内进行外展时，随着肩峰关节面倾斜角度减小，手臂有向外旋转的趋势。
