Scapulohumeral Rhythm

Scapulohumeral rhythm is when the scapula and the humerus move together in order to function properly. This action of the scapula and the humerus moving together is a 2:1 ratio because it is moving through two joints the scapulothoracic joint and the glenohumeral joint. Because scapulohumeral rhythm is movement between two joints it allows for greater range of motion. If one of these joints is not properly working then it will disrupt the scapulohumeral rhythm and range of motion measurements will be swayed from the correct measurements being the glenohumeral joint 120 degrees and the scapulothoracic joint being 60 degrees. If one joint is not working properly the client can have pain, decrease in total motion, or impingement. Joint congruency in the scapulohumeral rhythm also decreases the shear force. When the scapula and the humerus move together it can prevent active insufficiency where the muscle is not able to produce force to perform the proper movement. Scapulohumeral rhythm also allows for the ideal length-tension relationship. When there is no movement of the scapula at all friction forms in the subacromial space.













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