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KembaraXtra- Medicine – Adhesive Capsulitis (Frozen Shoulder)
Adhesive capsulitis of the shoulder, commonly known as frozen shoulder, is a clinical diagnosis characterized by pain and progressive restriction of both active and passive range of motion of the glenohumeral joint. The condition is often idiopathic, but it has strong associations with systemic diseases, most notably diabetes mellitus. Other associated conditions include thyroid disorders, Dupuytren contracture, cervical disc disease, atherosclerosis, neurologic disorders such as stroke and Parkinson disease, and HIV infection treated with antiretroviral therapy. Secondary adhesive capsulitis may develop after shoulder trauma, most commonly proximal humerus fractures, or following shoulder surgery.
The incidence of adhesive capsulitis peaks in individuals in their mid-50s. The nondominant shoulder is more frequently affected, and 6% to 17% of patients develop symptoms in the contralateral shoulder within five years. The prevalence in the general population is approximately 2% to 5%, but it rises significantly to 10% to 20% among patients with diabetes. Females are affected more commonly than males.
Frozen shoulder typically follows a predictable natural history consisting of three phases. The initial painful or “freezing” phase is marked by gradual onset of severe shoulder pain, often worse at night and when lying on the affected side. This phase can last from one week to as long as ten months and is associated with minimal loss of motion. The second “frozen” or intermediate phase is dominated by stiffness and significant restriction in shoulder range of motion, particularly glenohumeral abduction and external rotation. Pain usually improves during this stage and is often present only at the extremes of motion or at night; this phase may last up to one year. The final “thawing” or recovery phase involves gradual reduction in pain and progressive improvement in range of motion over one to three years, although some patients experience persistent long-term limitations.
The underlying pathology of adhesive capsulitis is not completely understood. The most widely accepted theory involves a chronic inflammatory process leading to fibroblastic proliferation, resulting in thickening and contraction of the glenohumeral joint capsule, coracohumeral ligament, and rotator interval. This capsular fibrosis ultimately restricts joint motion and produces the characteristic stiffness of the condition.
Diagnosis is primarily based on history and physical examination, with the key distinguishing feature being restricted passive range of motion, which helps differentiate adhesive capsulitis from rotator cuff tears. The differential diagnosis includes rotator cuff disease, calcific tendinitis, glenohumeral osteoarthritis, septic arthritis, traumatic injuries such as dislocation or labral tears, and cervical spine or neurologic pathology. Imaging is not required for diagnosis but may be useful to exclude alternative causes. Plain radiographs are often obtained initially, while ultrasound or MRI may be used if clinical uncertainty persists. Characteristic MRI findings include thickening of the coracohumeral ligament, inferior joint capsule thickness greater than 5 mm, and loss of the axillary pouch.
Management is largely conservative, and patient education is critical. Patients should be counseled that frozen shoulder is generally self-limited but may take 18 to 24 months or longer to fully resolve. Initial treatment includes heat application and analgesics, most commonly nonsteroidal antiinflammatory drugs. Supervised physical therapy is a cornerstone of treatment and focuses on gentle, gradual passive stretching and capsular mobilization performed multiple times daily for at least three to six months. Aggressive strengthening exercises should be avoided in the early stages.
Intraarticular corticosteroid injections into the glenohumeral joint can provide significant short- to mid-term symptom relief, particularly when administered during the early phases of the disease. These injections often improve pain control and facilitate participation in physical therapy. Surgical intervention is rarely required and is generally reserved for patients who fail to improve after four to six months of consistent conservative management. Surgical options include manipulation under anesthesia and arthroscopic capsular release, with open release being rarely indicated.
The prognosis for adhesive capsulitis is generally favorable. Most patients ultimately regain approximately 90% of shoulder motion with significant pain improvement, although symptoms may persist for several months to more than three years. Recurrence in the same shoulder is uncommon, but involvement of the opposite shoulder occurs in a minority of patients, particularly those with diabetes. Referral to rheumatology or orthopedic surgery should be considered for patients who do not respond to appropriate conservative treatment.
Key clinical pearls include the importance of assessing both active and passive range of motion, recognizing that surgical treatment is rarely necessary, and understanding that early corticosteroid therapy combined with gentle physical therapy can significantly improve symptoms and patient satisfaction, especially in the early stages of the disease.
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