(See the illustration, "Anatomy of a frozen shoulder.") It pivots mainly on a ball-and-socket arrangement called the glenohumeral joint, which joins the top of the humerus (upper arm bone) to a scooped-out part of the scapula (shoulder blade) called the glenoid cavity. The shoulder has a wider and more varied range of motion than any other part of the body. Fortunately, the shoulder can usually be unfrozen, though full recovery takes time - and lots of self-help. Sometimes freezing occurs because the shoulder has been immobilized for a long time by injury, surgery, or illness. We don't fully understand what causes a frozen shoulder, but an inflammatory process is probably involved.
It affects mainly people ages 40 to 60 - women more often than men. The resulting disability can be serious, and the condition tends to get worse with time if it's not treated.
But what is a frozen shoulder, exactly?įrozen shoulder (also called adhesive capsulitis) is a common disorder that causes pain, stiffness, and loss of normal range of motion in the shoulder. Simple activities like fastening a bra or taking a book off an overhead shelf can be impossible when you have a frozen shoulder.
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