The scapulohumeral rhythm is the ratio of movements between the scapula and humerus, it is very important for full range of motion at the shoulder. Full range of motion at the shoulder is 180 degrees, that is 120 degrees at the glenohumeral joint and 60 degrees at the scapulothoracic joint. The scapulohumeral rhythm is necessary for congruency between the scapulothoracic joint and the glenohumeral joint, that is, it makes sure everything is lined up and working way it is supposed to. When these to joints are synchronized and working together, it allows for good length tension relationships, it maintians the subacromial space to avoid impingements, it prevents active insufficiency, and decreases shear forces. If there is an issue with the scapulohumeral rhythm, there will likely be a decrease in range of motion and this can negativley affect the client's ability to perform everyday tasks.
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