Abstract
Optimal scapular position and movement are necessary for normal function of the shoulder joint and it is essential to focus on scapula in the rehabilitation for shoulder disorders. The aim of this study was to discover the relationship between the scapular initial position and scapular movement during dynamic motions in healthy young men. Thirty-four men participated in this study. The scapular angles at initial position and in elevation and lowering during flexion and abduction were measured using an electromagnetic tracking device. The scapular movements from 30° to 120° during flexion and abduction were calculated. Spearman's rank correlation coefficients were used to analyze the relationship between the scapular initial position and scapular movements. For upward rotation and posterior tilt of the scapula, there were significant positive correlations between the scapular initial position and scapular movement during flexion and abduction. For internal rotation, there were significant positive correlations, except 90° in lowering phase and 120° in both phases. While the humeral elevation increased, the correlation coefficients tended to decrease. Except for the internal rotation our results clarified the interactions between the scapular initial position and scapular movement during dynamic motions in healthy young men. The tendency of the decrease in correlation coefficient with elevation angle was shown.
Highlights
The shoulder complex consists of the glenohumeral, acromioclavicular, and scapulothoracicjoints and has the largest range of motion in the body[1]
The scapular initial position had an internal rotation of 29.7 ̊ (24.0 ̊, 32.9 ̊), upward rotation of 1.6 ̊ (3.4 ̊, 4.1 ̊), and posterior tilt of 5.2 ̊ (6.9 ̊, 3.7 ̊)
Post hoc test showed the significant differences between the scapular initial position and almost scapular movements in each rotation
Summary
The shoulder complex consists of the glenohumeral-, acromioclavicular-, and scapulothoracicjoints and has the largest range of motion in the body[1]. Normal shoulder function needs optimal scapular position and its movement because the scapula has an integrable role for the shoulder complex. Abnormal motion and position of the scapula are defined as scapular dyskinesis[2] and present as shoulder disorders[3,4,5,6]. Preventive strategies, treatments, and development of clinical tests for shoulder rehabilitation, should focus on scapular position and movement.
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