Scapulohumeral rhythm

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The scapulohumeral rhythm is clinically relevant for many reasons. The first reason being it allows a synchronized movement between the scapula and humerus to permit a good length-tension relationship. This is needed for efficient arm movement and helps to prevent active insufficiency. Another reason why this is clinically important to know and understand is because of how it helps to maintain the subacromial space, if it is not maintained then it will become impinged, and the client will experience quite a bit of pain and it can lead to other problems. For example, the ratio of this relationship is 2:1 (the humerus being 2 and scapula being 1) if the scapula doesn't move how it should then friction will occur in this space.

When the relationship between the scapula and humerus is in it's most optimal position it allows for a larger and more efficient range of motion to occur. The primary scapula movements for shoulder elevation is an upward rotation, posterior tilt, and then a lateral rotation. Dysfunction of one of the joints can result in one of these movements to not occur, which in turns leads to a decrease in range of motion. If a client's range of motion is less than 180 degrees than the client is unable to participate in his/her meaningful occupations and ADLs pain free. It is important for the therapist to realize this to give their client the best therapy experience.

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