Vahlensieck M, an Haack K, Schmidt H M
Department of Radiology, University of Bonn, Germany.
Surg Radiol Anat. 1994;16(1):101-4. doi: 10.1007/BF01627931.
Axial MR images of the shoulder joint reveal a central linear band within the supraspinatus muscle void of signal which seems not to represent the only tendon of this muscle. Due to the importance of the supraspinatus muscle for the painful impingement syndrome of the shoulder we studied the fibrous architecture of this muscle comparing 30 MR images and 49 cadaver dissections. We found the supraspinatus muscle to be composed of two distinct portions. The mean length of the ventral portion is 88 mm and of the dorsal portion 106 mm. The angle of the central tendon which is formed by fibers of both muscle portions relative to the frontal plane is 50 degrees. Both muscle portions probably act differently in moving the arm. This finding seems to be important for the pathophysiology of rotator cuff tears which are mainly located anteriorly within the ventral muscle portion and the eccentric central tendon.
肩关节的轴向磁共振成像显示，冈上肌内有一条中央线性带，信号缺失，似乎并非该肌肉的唯一肌腱。由于冈上肌对肩部疼痛性撞击综合征的重要性，我们研究了该肌肉的纤维结构，对比了30张磁共振图像和49例尸体解剖。我们发现冈上肌由两个不同部分组成。腹侧部分的平均长度为88毫米，背侧部分为106毫米。由两个肌肉部分的纤维形成的中央肌腱相对于额平面的角度为50度。两个肌肉部分在移动手臂时可能发挥不同作用。这一发现似乎对肩袖撕裂的病理生理学很重要，肩袖撕裂主要位于腹侧肌肉部分和偏心中央肌腱的前部。
