Adhesive capsulitis of the shoulder

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Adhesive capsulitis, also known as "frozen shoulder," is a condition characterized by shoulder pain and stiffness. Onset is gradual over weeks to months. A common shoulder ailment, adhesive capsulitis is marked by pain at rest but especially upon movement, as well as a decrease in passive range of motion (particularly in external rotation). The shoulder often does not hurt when touched (non-tender). The exact cause in most cases is unknown. Post-traumatic stiffness after injury or surgery to the shoulder is best considered separately from adhesive capsulitis, which is idiopathic, meaning there are no known causes. The underlying mechanism is believed to involve inflammation and scarring within the shoulder joint capsule, but the cause is unknown. Diagnosis is generally based on a person's symptoms and a physical exam. A key feature that can distinguish adhesive capsulitis from similar conditions is the inability of others to move the shoulder, in addition to the loss of voluntary movement...

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