期刊
JOURNAL OF SHOULDER AND ELBOW SURGERY
卷 10, 期 3, 页码 269-277出版社
MOSBY, INC
DOI: 10.1067/mse.2001.112954
关键词
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The purpose of this study was to describe 3-dimensional scapular motion patterns during dynamic shoulder movements with the use of a direct technique. Direct measurement of active scapular motion was accomplished by insertion of 2 1.6-mm bone pins into the spine of the scapula in 8 healthy volunteers (5 men, 3 women). A small, 3-dimensional motion sensor was rigidly fixed to the scapular pins. Sensors were also attached to the thoracic spine (T3) with tape and to the humerus with a specially designed cuff. During active scapular plane elevation, the scapula upwardly rotated (mean [SD] = 50 degrees [4.8 degrees]), tilted posteriorly around a medial-lateral axis (30 degrees [13.0 degrees]), and externally rotated around a vertical axis (24 degrees [12.8 degrees]). lowering of the arm resulted in a reversal of these motions in a slightly different pattern. The mean ratio of glenohumeral to scapulothoracic motion was 1.7:1. Normal scapular motion consists of substantial rotations around 3 axes, not simply upward rotation. Understanding normal scapular motion may assist in the identification of abnormal motion associated with various shoulder disorders.
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