SCAPULOHUMERAL RHYTHM AND THE SHOULDER

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     The scapulohumeral rhythm is the ratio between the scapula and the humerus.  For every 3 degree of shoulder movements, there is one degree at the ST joint and  two degree at the GH joint, with a ratio of 1:2. To get the full range of motion, the humeral head is rotated laterally and then the motion is distributed between two joints. The scapulohumeral rhythm is not measured, but to know when the rhythm is off or not, we check both the the scapula and humerus and see if they are moving together and if they are not, it means the scapulohumeral rhythm is off. 
     The Scapulohumeral rhythm is clinically important because it allows for large range of motion at the shoulder when the joint moves.  The scapulohumeral rhythm keeps the glenoid fossa in constant contact with the head of the humerus when it glides interiorly. The scapulohumeral rhythm is also helpful to obtain a good movement in multiple planes of motion. During scapulohumeral rhythm, if the scapula doesnt move, shoulder elevation gets limited during shoulder abduction and flexion, then there's also increase in friction at the GH joint, leading to impingement of structures within the subacromial space.

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