
Adhesive Capsulitis, also known as Frozen Shoulder is a condition that causes restriction of motion in the shoulder joint. The cause of a frozen shoulder is not well understood, but it often occurs for no known reason. Frozen shoulder causes the capsule surrounding the shoulder joint to contract and form scar tissue.
What causes frozen shoulder?
Most often, frozen shoulder occurs with no associated injury or discernible cause. There are patients who develop a frozen shoulder after a traumatic injury to the shoulder, but this is not the usual cause. Some risk factors for developing a frozen shoulder include:
Age & Gender
Frozen shoulder most commonly affects patients between the ages of 40 to 60 years old, and it is twice as common in women than in men.
Endocrine Disorders
Patients with diabetes are at particular risk for developing a frozen shoulder. Other endocrine abnormalities, such as thyroid problems, can also lead to this condition.
Shoulder Trauma or Surgery
Patients who sustain a shoulder injury, or undergo surgery on the shoulder can develop a frozen shoulder joint. When injury or surgery is followed by prolonged joint immobilisation, the risk of developing a frozen shoulder is highest.
Other Systemic Conditions
Several systemic conditions such as heart disease and Parkinson's disease have also been associated with an increased risk for developing a frozen shoulder.
What happens with a frozen shoulder?
No one really understands why some people develop a frozen shoulder. For some reason, the shoulder joint becomes stiff and scarred. The shoulder joint is a ball and socket joint. The ball is the top of the arm bone (the humeral head), and the socket is part of the shoulder blade (the glenoid). Surrounding this ball-and-socket joint is a capsule of tissue that envelops the joint.
Normally, the shoulder joint allows more motion than any other joint in the body. When a patient develops a frozen shoulder, the capsule that surrounds the shoulder joint becomes contracted. The patients form bands of scar tissue called adhesions. The contraction of the capsule and the formation of the adhesions cause the frozen shoulder to become stiff and cause movement to become painful.
A frozen shoulder causes a typical set of symptoms that can be identified by your doctor. The most important finding is restricted movement. Other shoulder conditions can cause difficulty with movement of the shoulder, such as a rotator cuff tear; therefore it is important to have an examiner familiar with this condition for a proper diagnosis.
What are the typical symptoms of a frozen shoulder?
Shoulder pain; usually a dull, aching pain
Limited movement of the shoulder
Difficulty with activities such as brushing hair, putting on shirts/bras
Pain when trying to sleep on the affected shoulder
What are the stages of a frozen shoulder?
Painful/Freezing Stage
This is the most painful stage of a frozen shoulder. Motion is restricted, but the shoulder is not as stiff as the frozen stage. This painful stage typically lasts 6-12 weeks.
Frozen Stage
During the frozen stage, the pain usually eases up, but the stiffness worsens. The frozen stage can last 4-6 months.
Thawing Stage
The thawing stage is gradual, and motion steadily improves over a lengthy period of time. The thawing stage can last more than a year.
What tests are needed to diagnose a frozen shoulder?
Most often, a frozen shoulder can be diagnosed on examination, and no special tests are needed. An x-ray is usually obtained to ensure the shoulder joint appears normal, and there is not evidence of traumatic injury or arthritic changes to the joint. An MRI is sometimes performed if the diagnosis is in question, but this test is better at looking for other problems, rather than looking for frozen shoulder. If an MRI is done, it is best performed with an injection of contrast fluid into the shoulder joint prior to the MRI. This will help show if the capsule of the shoulder is scarred down, as would be expected in patients with a frozen shoulder.
Frozen shoulder treatment primarily consists of pain relief and physical therapy. Most patients find relief with these simple steps, although the entire treatment process can take several months or longer.
Exercises and Stretching
Stretching exercises for frozen shoulder serves two functions:
First, to increase the motion in the joint
Second, to minimize the loss of muscle on the affected arm (muscle atrophy)
The importance of stretching and exercises cannot be overemphasized as these are the key to successful frozen shoulder treatment. Patients cannot expect to have successful frozen shoulder treatment if they perform exercises only when working with a therapist. These exercises and stretches must be performed several times daily.
Moist Heat
Applications of moist heat to the shoulder can help to loosen the joint and provide relief of pain. Patients can apply moist heat to the shoulder, then perform their stretching exercises--this should be done at least three times daily. Moist heat can be applied by using a hot-soaked washcloth on the joint for 10 minutes before stretching.
Physical Therapy
Physical therapists can help a patient develop a stretching and exercise program, and also incorporate ultrasound, ice, heat, and other modalities into the rehabilitation for frozen shoulder. As said previously, it is important that patients perform their stretches and exercise several times daily-not only when working with the therapist.
Anti-inflammatory Medications
Anti-inflammatory medications have not been shown to significantly alter the course of a frozen shoulder, but these medications can be helpful in offering relief from the painful symptoms.
Cortisone Injections
Cortisone injections are also commonly used to decrease the inflammation in the frozen shoulder joint. It is unclear the extent of the benefit of a cortisone injection, but it can help to decrease pain, and in turn allow for more stretching and physical therapy. What is known, is the cortisone is only effective when used in conjunction with physical therapy for the management of a frozen shoulder.
Will I need surgery for frozen shoulder?
If the above treatments do not resolve the frozen shoulder, occasionally a patient will need to have surgery. If this is the case, the surgeon may perform a manipulation under anaesthesia. A manipulation is performed with the patient sedated under anaesthesia, and the doctor moves the arm to break up adhesions caused by frozen shoulder. There is no actual surgery involved, meaning incisions are not made when a manipulation is performed.
Alternatively, or in conjunction with a manipulation, an arthroscope can be inserted into the joint to cut through adhesions. This procedure is called an arthroscopic capsular release. Surgical capsular release of a frozen shoulder is rarely necessary, but it is extremely useful in cases of frozen shoulder that do not respond to therapy and rehab. If surgery is performed, immediate physical therapy following the capsular release is of utmost importance. If rehab does not begin soon after capsular release, the chance of the frozen shoulder returning is quite high.
Will my shoulder motion return to normal?
Most patients who have a frozen shoulder will have slight limitations in shoulder motion, even years after the condition resolves. However, this limit in motion is minimal, and often only noticed when performing a careful physical examination. The vast majority of patients who develop a frozen shoulder will recover their functional motion with therapy and stretching alone.
Sources:
Warner, JJ. "Frozen Shoulder: Diagnosis and Management" J. Am. Acad. Ortho. Surg., May 1997; 5: 130 - 140.
Griggs, SM; Ahn, A; Green, A. "Idiopathic Adhesive Capsulitis: A Prospective Functional Outcome Study of Nonoperative Treatment" J. Bone Joint Surg. Am., Oct 2000; 82: 1398.
Rizk, TE; Pinals, RS; and Talaiver, AS. "Corticosteroid injections in adhesive capsulitis" Arch. Phys. Med. and Rehab., 72: 20-22, 1991.













