The shoulder is a fragile joint in the body. This ball and socket joint has the greatest mobility throughout the entire body, and its only connection is the sternoclavicular joint. Scapulohumeral rhythm is the ratio of movement between the scapula and humerus. The exact ratio is every 3° of shoulder movement there is 1° of movement for the scapulothoracic joint, the joint between the scapula and the rib cage even though this joint isn't a true joint, and 2° of movement for glenohumeral joint, the joint between the glenoid fossa of the scapula and the humerus. When there is poor upward scapular rotation this can reduce the subacromial space is the shoulder joint causes pain, impingement, function of the joint and even damage the structures within the space. Check both shoulder's on your client because one side will likely be different compared to the other side. If there is weakness present there is probably a problem with one of the rotator cuff muscles, supraspinatus, infraspinatus, teres minor, and subscapularis. This is a delicate joint to work on, proceed with caution.
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