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Effects of anteroinferior capsulolabral incision and resection on glenohumeral joint reaction force |
 | | The glenohumeral joint reaction force was resolved into three orthogonal components: (1) force perpendicular to the glenoid (compression force), (2) force-directed anterior to the glenoid (anterior-directed force), and (3) force-directed superior to the glenoid (superior directed force). |
 | | Additional glenohumeral joints were not tested because post hoc power analysis indicated that a minimum of 20 glenohumeral joints would be required to demonstrate differences in the compression force in comparison of the intact condition and either of the two simulated capsulolabral lesion conditions. |
 | | Because of their orientation to the glenohumeral joint, muscles that move the shoulder contribute to anterior joint stability through "concavity compression." Coined by Lippett and coworkers, this term refers to the component of the joint reaction force that acts perpendicular to the glenoid fossa, compressing the humeral head [20]. |
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