Department of Orthopaedic Biomaterial Science, Osaka University Graduate School of Medicine, 2-2 Yamada-oka, Suita City, Osaka, 565-0871, Japan.
Int Orthop. 2011 Oct;35(10):1503-9. doi: 10.1007/s00264-011-1219-5. Epub 2011 Jun 15.
The purpose of this study was to assess accurately the three-dimensional movements of the scapula and humerus relative to the thorax during internal/external rotation motion with abduction of the shoulder joint.
Ten right shoulders of ten healthy volunteers were examined using a wide-gantry open magnetic resonance imaging (MRI) system. MRI was performed every 30° from 90° external rotation to 90° internal rotation of the shoulder joint.
The contribution ratio of the scapulothoracic joint was 12.5% about the long axis of the humerus during internal/external rotation motion. With arm position changes from 90° external rotation to 60° internal rotation, most movement was performed by the glenohumeral joint. Conversely, at internal rotation of ≥60°, the scapula began to markedly tilt in the anterior direction. At 90° internal rotation, the scapula was significantly tilted anteriorly (p < 0.05) when compared with the other positions.
We clarified the existence of a specific scapulohumeral motion pattern, whereby the glenohumeral joint moves with internal rotation and the scapulothoracic joint moves with anterior tilt together with internal rotation motion of the shoulder joint.
本研究旨在评估肩关节外展时，在内、外旋运动中肩胛骨和肱骨相对于胸廓的三维运动。
使用宽孔径开放式磁共振成像（MRI）系统对 10 名健康志愿者的 10 个右侧肩部进行了检查。MRI 检查在肩关节从 90°外旋到 90°内旋的每 30°进行一次。
在肩关节内、外旋运动中，肩胛骨相对于肱骨长轴的贡献比例为 12.5%。随着手臂位置从 90°外旋到 60°内旋的变化，大部分运动由盂肱关节完成。相反，在≥60°的内旋时，肩胛骨开始明显向前倾斜。在 90°内旋时，与其他位置相比，肩胛骨明显向前倾斜（p<0.05）。
我们阐明了一种特定的肩胛胸关节运动模式的存在，即盂肱关节随内旋运动，肩胛胸关节随内旋运动同时向前倾斜。
