Scapulohumeral Rhythm


Scapulohumeral rhythm is the term used to describe ratio of movement between the scapula and humerus during shoulder elevation. This is a 3:2:1 ratio, meaning that for every 3 degrees of shoulder elevation, there are 2 degrees of movement in the glenohumeral joint, and 1 degree of movement in the scapulothoracic joint. This ratio is clinically important for many reasons. One reason is that when working as it should, this rhythm allows for full ROM at the shoulder joint. If a client has atypical function in either of these joints, their ROM will be hindered because they must work in conjunction for full ROM to occur. The scapulohumeral rhythm allows the glenoid fossa to remain in a stable position during the many different movements of the head of the humerus. Additionally, it provides a better length-tension relationship amongst the shoulder muscles so that they can create more force needed to accomplish movements. When these joints are not working together properly, the client could experience pain or impingement in their joints.

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