Biomechanics Post #3 -- Scapulohumeral Rhythm


            Scapulohumeral rhythm is the ratio of movement between the scapula and the humerus to maintain optimal congruency between the glenoid fossa and the head of the humerus. When performing abduction of the humerus in the frontal plane about the sagittal axis, for every degree of upward rotation of the scapula at the scapulothoracic joint, the glenohumeral joint abducts the humerus two degrees. This phenomenon also allows for a greater range of motion at the shoulder without compromising the stability of the joint. If the scapula did not upwardly rotate as the humerus abducts, we would not be able to put our arms above our heads—it would greatly restrict our range of motion at the shoulder. With this synchronized movement, the muscles can maintain the optimal length-tension relationship, and it helps maintain the sub-acromial space so that there is not an impingement. The congruency of the joints also results in decreased shear forces.

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