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Scapulohumeral Rhythm

Simultaneous movement between the scapula and humerus is referred to as Scapulohumeral Rhythm. The shoulder has three degrees of movement, 1 degree (60 degrees) in the ST joint and two degrees (120 degrees) in the GH joint. Motion must be distributed evenly between the two joints in order to achieve full range of motion. Having the two joints working together, limits the stress put on a singular joint. It is important for the two joints to be congruent with one another so the two structures may move synchronously. The scapula plays a huge role in stabilizing the GH joints in order to achieve total motion. Each joint contributes to the total amount of movement that may take place at the shoulder, therefore, dysfunction at one will result in decrease of ROM due to the increase risk of impingement, pain, and overall function. Scapulohumeral Rhythm ensures the healthy length-tension relationships of the two structures while moving together and acting against force.





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