The shoulder is composed of the shoulder blade (scapula), collarbone (clavicle), and upper arm bone (humerus). With two joints, the glenohumeral and acromioclavicular, the shoulder is widely considered to be the most unstable joint. It can move in multiple directions and allows you to apply force or pressure, which is why the shoulder is more prone to injury than any other joint in the human body.
https://www.raleighortho.com/blog/avoiding-shoulder-injuries/
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