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The influence of handheld weight on the scapulohumeral rhythm.
- Source :
-
Journal of shoulder and elbow surgery [J Shoulder Elbow Surg] 2008 Nov-Dec; Vol. 17 (6), pp. 943-6. Date of Electronic Publication: 2008 Sep 18. - Publication Year :
- 2008
-
Abstract
- Scapulohumeral rhythm (SHR) provides insight to neuromuscular control and fundamental biomechanics of the shoulder. This rhythm often is disrupted in pathologic shoulders. As the first step, we sought to quantify SHR in healthy subjects for diagnostic assessment of shoulder function. Ten healthy shoulders were studied. Three-dimensional models of the humerus and scapula were created from computed tomography scans. Dynamic shoulder motion was recorded by use of single-plane fluoroscopy during arm abduction with 0-kg and 3-kg handheld loads. Shoulder kinematics were quantified by use of model-based 3-dimensional-to-2-dimensional registration techniques. SHR decreased (more scapular motion) with increasing abduction. With a 3-kg load, scapulothoracic motion was significantly reduced through the range of 35 degrees to 45 degrees of glenohumeral motion. Muscular stabilization of the scapula increased with external loading, as shown by decreased SHR during early lifting. Dynamic scapular stabilization provides a critical platform for upper extremity activity.
Details
- Language :
- English
- ISSN :
- 1532-6500
- Volume :
- 17
- Issue :
- 6
- Database :
- MEDLINE
- Journal :
- Journal of shoulder and elbow surgery
- Publication Type :
- Academic Journal
- Accession number :
- 18804388
- Full Text :
- https://doi.org/10.1016/j.jse.2008.05.047