Scapulohumeral Rhythm

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Scapulohumeral rhythm is the ratio of movement between the scapula and humerus. For every 3 degrees of shoulder movement there is 1 degree of movement at the scapulothoracic(ST) joint and 2 degrees of movement at the glenohumeral(GH) joint. Scapulohumeral rhythm is important for healthy function of the shoulder. The GH joint is the articulation between the head of the humerus and the glenoid fossa of the scapula. The ST joint is the articulation between the anterior surface of the scapula and the posterior thoracic cage. Full range of motion for shoulder elevation between these two joints is 180 degrees. Range of motion is important in determining normal joint function. Abnormal function of these joints can affect the scapulohumeral rhythm indicating a dysfunction. The relevance of scapulohumeral rhythm is that it permits good length-tension relationships. This means the muscles won't shorten as much as they normally would. If it didn't do this you could have impingements. Scapulohumeral rhythms is important in the clinical examination of the shoulder in order to determine shoulder range of motion. For full range of motion of the shoulder, the humeral head must rotate. The ST joint and GH joint are congruent, decreasing the shear force between the bones. 

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