The shoulder joint is a ball and socket joint and the joint is surrounded by a structure called a joint capsule. The joint capsule is usually very mobile and flexible, moving freely as you move your arm. A frozen shoulder is when the joint capsule becomes inflamed, thickened and stiffer, subsequently causing pain and loss of movement at the shoulder joint. A frozen shoulder is also described as adhesive capsulitis, a stiff shoulder or a contracted shoulder.
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