Biomechanics blog post #3

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Scapulohumeral rhythm is clinically important for optimal function of the shoulder. It provides coordinated movement patterns between the scapula and the humerus by permitting a good length-tension relationship. This is essential to promote motion in the shoulder and decrease active insufficiency. Another reason why the scapulothoracic rhythm is relevant is that it allows for the glenoid fossa to maintain proper position so that the humeral head can produce various movement. This coordinated movement is referred to as a 2:1 ratio and is necessary to avoid shoulder impingement.

The scapula consists of three main movements that are described as upward rotation, posterior tilt, and lateral rotation. When there is a change in normal position, and one or all of these movements are affected, the scapulothoracic rhythm is disturbed. This will lead to a client having a decrease ROM and possible shoulder impairment. This will affect the client’s ability to participate in activities of daily living. OT’s must understand the importance of the scapulohumeral rhythm as is it will dictate the intervention and treatment plan of the client.

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