Frozen shoulder is the common term for adhesive capsulitis, an inflammatory condition that restricts motion in the shoulder.
Causes, incidence, and risk factors
The capsule of a shoulder joint includes the ligaments that attach the shoulder bones to each other. When inflammation occurs within the capsule, there is less ability for the shoulder bones to freely move within the joint. Diabetes, shoulder trauma (including surgery), a history of open heart surgery, hyperthyroidism, and a history of cervical disk disease are all associated with an increased risk for this problem.
Signs and tests
The diagnosis is made primarily by physical exam and the patient's medical history. There is usually a history of shoulder pain followed by severe stiffness that may not be very painful. If the patient has any history of the risk factors associated with frozen shoulder, these may require treatment as well. Imaging studies such as X-rays are routine to make sure there is no other problem, such as arthritis. MRI exams may show diffuse inflammation, but there are no findings specific to frozen shoulder.
Treatment
The mainstay of treatment is with non-steroidal anti-inflammatory medications (NSAIDs) and physical therapy. While this condition nearly always improves with this intervention, it can take as long as 12 to 18 months to see improvement. The physical therapy is intense and needs to be performed by the patient on a daily basis at home to be successful. If therapy is not successful, or if a patient is unable to tolerate therapy, a shoulder manipulation may be performed. Under anesthesia, the shoulder may be forcibly brought through a range of motion to release the scar tissue. Surgery to remove all the sticky scar tissue in the joint is usually done arthroscopically. Some surgeons may use repeated pain blocks after surgery to allow the patient to painlessly participate in physical therapy after surgery.
Expectations (prognosis)
With therapy and NSAIDs, the problem will usually resolve within a year. When required, surgery is usually successful in restoring motion, but therapy must be continued for several weeks to months after surgery to prevent recurrence. The most common reason for any treatment to fail is non-compliance with therapy.
Complications
Complications include persistent stiffness and pain despite therapy. If there is forceful manipulation of the shoulder during surgery, the arm can break.
Calling your health care provider
If you have shoulder pain and stiffness and suspect you may have a frozen shoulder, contact your health care provider for proper referral and treatment.
Prevention
The best way to prevent frozen shoulder is to contact your health care provider if you develop shoulder pain that limits your range of motion for an extended period of time. This will allow early treatment and help avoid stiffness, if possible. Diabetic patients should keep tight control of their blood glucose levels; despite this, they may still develop shoulder stiffness.