Shoulder complex solves its mobility vs stability conflict by distributing its large ROM across all its mobile components. Among them the glenohumeral and scapulohthoracic joints are major contributors whereas the other two articulations of shoulder complex, the acromioclavicular and sternoclavicular joints have key functions in the scapulothoracic motion. These four joints work in a close kinematic chain. The arm needs synchronized action of all these segments to move efficiently, this coordinated movement pattern is what we call as scapulo-humeral rhythm (SHR). The SHR can be compared to an orchestra where each structure plays its individual role at the right time from the right place to produce a harmonized motion.
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