Scapulohumeral rhythm desccribes the ratio of movement between the scapula and and humerus. For every one degree that the scapula moves, the humerus moves two degrees. This rhythm is very important because it allows the muscles involved to be in optimal length tension relationship. If you know that full range of motion in abduction is 180 degrees, the scapula should move 60 degrees and the humerus 120 degrees. Knowing this can help you in detecting abnormal measurements for range of motion. The motion is distributed between two joints- the scapulothoracic and the glenohumeral joint. This helps to prevent active insufficiency in muscles of the glenohumeral joint. It also allows for full range of motion. If the scapula did not move, there would be friction in the subacromial space. The rhythm also keeps impingement from occurring in the subacromial space that could result in tearing the supraspinatous.
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