Shibuta H, Tamai K, Tabuchi K
Department of Orthopaedic Surgery, Yokohama Rosai Hospital, Japan.
Clin Orthop Relat Res. 1998 Mar(348):107-13.
To simulate the painful arm position in subacromial impingement syndrome, magnetic resonance imaging of the shoulder was done with the arms at the sides and at 80 degrees abduction in two groups of patients. Group A had 20 shoulders in 20 patients with subacromial impingement syndrome and Group B had 19 shoulders in 19 patients without impingement syndrome. When arm position was changed from adduction to abduction, an increase in signal intensity of the rotator cuff tendon was seen more often in Group A (45%) than in Group B (26%). Group A shoulders showed encroachment of the acromion or the acromioclavicular joint to the rotator cuff in 25% of the shoulders with the arms at the sides, and in 75% with the arms in abduction. Similar findings were observed in only 14% and 21% of Group B shoulders in the respective arm positions. Abduction of the arms seemed to cause encroachment of the overlying structure, especially of the acromioclavicular joint, to the rotator cuff in patients with subacromial impingement syndrome, even if there were no such findings in the images with the arms at the sides.
为模拟肩峰下撞击综合征中引起疼痛的手臂姿势，对两组患者在手臂位于身体两侧及外展80度时进行了肩部磁共振成像检查。A组有20例患有肩峰下撞击综合征患者的20个肩部，B组有19例无撞击综合征患者的19个肩部。当手臂姿势从内收变为外展时，A组（45%）比B组（26%）更常出现肩袖肌腱信号强度增加。A组肩部在手臂位于身体两侧时，25%的肩部显示肩峰或肩锁关节对肩袖有压迫，手臂外展时75%的肩部有压迫。在B组肩部中，相应手臂姿势下分别只有14%和21%出现类似表现。手臂外展似乎会导致肩峰下撞击综合征患者的上方结构，尤其是肩锁关节，对肩袖产生压迫，即使在手臂位于身体两侧的图像中没有此类表现。
