Scapulohumeral Rhythm

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 The Scapulohumeral Rhythm is the ratio of movement between the scapula and humerus. The ratio between the scapulothoracic joint and the glenohumeral joint is 1:2. When using full 180º of motion, the scapulothoracic joint would be 60º, and the glenohumeral joint would be 120º. In order to achieve full range of motion in the shoulder, the humeral head has to rotate laterally. To allow more range of motion, the movement is distributed between those two joints. In other words, this helps evenly distribute in more than just one joint to increase stability in the shoulder. The upward rotation helps permit good length-tension relationships with muscles and it prevents insufficiencies. The joint congruency reduces shear forces by the maintain the glenoid fossa in an optimal position. If this did not exist, there would be shoulder instability by the impingement of the humerus and the acromion. This would be painful to perform extension, flexion, adduction, abduction, and external and internal rotation of the humerus. This could result in the client compensating with extra movements that are not usually done in shoulder movements. The client’s range of motion would be compromised due to lack of stability and inflammation of the muscles. 

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