Subacromial Bursitis: Causes, Signs & Treatment

Subacromial bursitis is a condition where the subacromial bursa, a fluid-filled sac in the shoulder joint, becomes swollen and painful. Related conditions, such as prepatellar bursitis, can affect other joints like the knee. Learn more about shoulder bursitis, its causes, treatments and more from our shoulder experts.

What You Need to Know About Subacromial Bursitis

• What Is Subacromial Bursitis?
• What Causes Subacromial Bursitis?
• Subacromial Bursitis Symptoms
• How Is Subacromial Bursitis Diagnosed?
• Subacromial Bursitis Treatment

What Is Subacromial Bursitis?

The subacromial bursa is a fluid-filled sac in the shoulder, located between the tip of the shoulder (the acromion) and the rotator cuff. When functioning correctly, the bursa acts as a cushion and helps reduce friction between the rotator cuff tendons and the acromion, allowing free and easy movement in the shoulder joint.

The subacromial bursa plays a crucial role in shoulder anatomy and function. Inflammation and thickening of the bursa can lead to pain and impingement symptoms, making it difficult to move the shoulder and interfering with daily activities.

Anatomy and Function of the Shoulder

The shoulder joint, or glenohumeral joint, is one of the most complex and mobile joints in the human body. It is made up of several key structures, including bones, ligaments, tendons and muscles, all working together to provide an impressive range of motion. The rotator cuff muscles (supraspinatus, infraspinatus, teres minor and subscapularis) are essential for stabilizing the shoulder and allowing for smooth, controlled movement.

Thanks to its unique anatomy, the shoulder joint can perform a wide variety of movements, including flexion, extension, abduction, adduction, rotation and circumduction. This balance of mobility and stability enables us to perform everyday tasks and more complex actions, such as throwing or catching, with ease. Keeping the subacromial bursa and rotator cuff healthy is essential for maintaining pain-free movement and preventing shoulder problems.

What Causes Subacromial Bursitis?

Shoulder bursitis is usually caused by constant stress or friction against the bursa. It can happen if you do a lot of repeated arm motions, especially with your arm raised. Subacromial bursitis is often a problem for painters, construction workers and athletes. Sports medicine specialists, such as orthopedic surgeons, have expertise in treating shoulder bursitis and related injuries in athletes.

Shoulder bursitis can also occur due to other preexisting conditions like arthritis, diabetes, tendonitis, gout or thyroid disease. Other shoulder pathologies, such as rotator cuff injury and acromioclavicular joint osteoarthritis, can also contribute to the development of subacromial bursitis. Shoulder instability may increase the risk of bursitis by altering normal shoulder mechanics. It can also be caused by a bacterial infection in the bursa itself.

Subacromial Bursitis Shoulder Pain Symptoms

Shoulder bursitis often causes pain and tenderness in the shoulder. You may have a limited range of motion and pain while resting. Patients also report waking up at night due to shoulder pain. Some patients report a persistent dull ache, especially during movement. Pain may be triggered or worsened by moving the arm forward or performing overhead activities. Patients may experience a painful arc, particularly when lifting the arm between 60 and 120 degrees.

In severe cases, the swollen bursa may radiate warmth or become infected, causing fever and fatigue. Septic bursitis can present with the same symptoms as non-infectious bursitis. The pain can also begin to spread and affect other parts of the arm and shoulder.

How Is Subacromial Bursitis Diagnosed?

During your appointment, a Resurgens Orthopaedics shoulder physician will first discuss your medical history and how the condition started. Then, they will perform a physical examination and check your pain levels and range of motion. This exam is brief and only causes mild discomfort.

During the physical examination, the physician may assess for pain or weakness during resisted abduction, internal rotation and external rotation to help differentiate between bursitis and rotator cuff injuries. The biceps tendon is also evaluated during the exam as a potential source of shoulder pain.

Your doctor may order diagnostic screenings to rule out any other shoulder conditions. If infection is suspected, joint aspiration may be performed, and analysis of the synovial fluid can help rule out septic bursitis. Magnetic resonance imaging can be used to provide detailed images of the subacromial space and detect bursa thickening, rotator cuff tears or complete tears when X-rays are inconclusive. From there, they will make a diagnosis and recommend a treatment plan for your recovery.

Related Conditions and Impingement Syndrome

Shoulder impingement syndrome, also known as subacromial impingement syndrome, is a common condition that occurs when the rotator cuff tendons become compressed or pinched between the acromion and the humeral head. This impingement can lead to inflammation, pain and weakness in the affected shoulder, often making it difficult to lift the arm or perform overhead activities.

Impingement syndrome can develop due to repetitive overhead motions, direct trauma or degenerative changes in the shoulder joint. Over time, this compression may result in chronic bursitis, tendonitis or even rotator cuff tears, further limiting mobility and causing persistent discomfort.

Early recognition and treatment of impingement syndrome are vital to prevent long-term damage to the rotator cuff and surrounding structures. Addressing these related conditions promptly can help restore function, reduce pain and improve overall shoulder health.

Subacromial Bursitis Treatment

There are several treatment options for subacromial bursitis, and most mild to moderate conditions can be treated with non-surgical methods. More severe cases may require surgical treatment.

Non-operative treatment is typically the first step and may include:

• Rest
• Nonsteroidal anti-inflammatory drugs (NSAIDs)
• Ice
• Physical therapy

Conservative therapy is usually effective, and most patients improve with this approach. An individualized exercise program is an important part of rehabilitation to restore shoulder mobility, strength and function. Early intervention during the acute phase of bursitis can help prevent progression to chronic symptoms. Older patients may have a slower recovery or less favorable outcomes compared to younger individuals.

If your shoulder bursitis does not respond to non-surgical treatments, your physician may recommend surgery. During this minimally invasive arthroscopic procedure, a surgeon will remove any damaged tissue that is irritating the bursa. They may also remove the bursa to help the joint move more fluidly. The goal of surgery is to decrease impingement and improve shoulder mobility.

Surgical Intervention for Subacromial Bursitis

While most cases of subacromial bursitis respond well to conservative treatment, some patients with severe symptoms or persistent pain may require surgical intervention. The primary goal of surgery is to relieve pressure on the rotator cuff tendons and reduce inflammation in the subacromial bursa.

Common surgical procedures include bursectomy (removal of the inflamed bursa) and acromioplasty (reshaping the acromion to create more space for the rotator cuff). These surgeries can often be performed arthroscopically, using small incisions and specialized instruments, which typically results in a quicker recovery. In cases where there is significant tendon damage, rotator cuff repair may also be necessary.

After surgery, a structured rehabilitation program is essential to restore strength, flexibility and function to the shoulder. Following your orthopedic surgeon’s recommendations and participating in physical therapy can help ensure the best possible outcome and reduce the risk of future shoulder problems.

Prognosis, Complications and Risks

The outlook for most patients with subacromial bursitis is very positive, especially when the condition is treated early with conservative measures. With rest, physical therapy and anti-inflammatory medications, most patients experience significant relief from pain and a return to normal activities.

However, if chronic bursitis or impingement syndrome is left untreated, it can lead to more serious complications, such as rotator cuff tears, tendonitis or adhesive capsulitis (frozen shoulder). These conditions can cause long-term pain, stiffness and even permanent loss of shoulder function.

Surgical treatment, while generally safe, does carry some risks, including infection, bleeding and nerve injury. That’s why early diagnosis, appropriate conservative treatment and a comprehensive rehabilitation plan are so important for minimizing complications and achieving the best possible results.

Prevention and Management Tips

Preventing subacromial bursitis and impingement syndrome starts with maintaining good posture and avoiding repetitive overhead activities that can strain the shoulder joint. Strengthening the rotator cuff muscles through targeted exercises can help support the shoulder and decrease the risk of injury.

If you’re recovering from shoulder bursitis, conservative management strategies such as rest, ice, compression and elevation (RICE), along with physical therapy and anti-inflammatory medications, can help reduce pain and inflammation. Avoiding heavy lifting and overhead movements can also protect the shoulder from further irritation.

Incorporating regular stretching and strengthening exercises into your routine can help maintain flexibility and stability in the shoulder joint. Early recognition of bursitis symptoms and prompt treatment are key to preventing long-term damage and ensuring a full recovery, so you can continue to enjoy an active lifestyle.

If shoulder pain is keeping you from doing the things you love, schedule an appointment with a Resurgens Orthopaedics shoulder specialist today to start your path toward recovery.