Shoulder

Subacromial Bursitis

Subacromial bursitis is a leading cause of shoulder pain, arising when the largest bursa in the body becomes inflamed — typically in the setting of impingement, rotator cuff pathology, or repetitive overhead use. At Maryland Orthopedic Specialists, our team precisely diagnoses this condition and offers effective treatments to resolve inflammation, restore pain-free movement, and address the underlying mechanical contributors that caused the problem.

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What is subacromial bursitis?

A bursa is a fluid-filled sac that cushions tendons and bones, reducing friction during movement. The subacromial bursa lies between the rotator cuff tendons (above) and the undersurface of the acromion and deltoid (below). It is the largest bursa in the human body and serves as the principal lubricating structure within the subacromial space.

A bursa is a fluid-filled sac that cushions tendons and bones, reducing friction during movement. The subacromial bursa lies between the rotator cuff tendons (above) and the undersurface of the acromion and deltoid (below). It is the largest bursa in the human body and serves as the principal lubricating structure within the subacromial space.

When the subacromial space is narrowed — due to a hooked acromion, rotator cuff thickening, poor scapular mechanics, or overhead overuse — the bursa is repetitively compressed and irritated, triggering an inflammatory cascade. Bursal wall thickening, increased vascularity, and fluid accumulation result in the clinical syndrome of subacromial bursitis.

Causes and Associated Conditions

Subacromial bursitis rarely occurs in isolation. Contributing and associated conditions include:

Shoulder impingement syndrome (subacromial impingement is the most common mechanical cause)
Rotator cuff tendinopathy or partial tears (the bursa lies directly over the cuff)
Calcific tendinitis (calcium deposits in the cuff can provoke intense bursal inflammation)
Overuse and repetitive overhead activity (overhead athletes, painters, electricians)
Inflammatory arthritis (rheumatoid arthritis, crystal arthropathies)
Direct trauma

Treatment options

Subacromial Corticosteroid Injection (Primary Treatment)

Ultrasound-guided injection of corticosteroid and local anesthetic into the subacromial bursa is the primary treatment for subacromial bursitis and provides rapid, significant pain relief in the majority of patients. It simultaneously confirms the diagnosis and treats the condition. Most patients experience relief within 3–7 days. Up to two to three injections per shoulder per year are appropriate.

Physical Therapy

PT targets the underlying mechanical impingement drivers: rotator cuff strengthening (especially external rotators), posterior capsule stretching, and scapular stabilization. Correcting these deficits reduces the compressive forces on the bursa during overhead activity and prevents recurrence.

NSAIDs and Activity Modification

A short course of anti-inflammatory medication combined with temporary reduction of provocative activities reduces the acute inflammatory burden.

Surgical Procedure

Subacromial Decompression / Acromioplasty

Arthroscopic shaving of the undersurface of the acromion to enlarge the subacromial space, relieve mechanical impingement on the rotator cuff tendons, and address the bony component of impingement syndrome.

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Shoulder Arthroscopy (Diagnostic & Operative)

Minimally invasive diagnostic and operative scope of the glenohumeral joint and subacromial space, used to evaluate and treat labral tears, rotator cuff pathology, AC joint arthritis, loose bodies, and synovitis.

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Frequently Asked Questions

How is bursitis different from a rotator cuff tear?

Bursitis involves inflammation of the bursal sac overlying intact (though possibly degenerating) tendons. A rotator cuff tear involves actual tearing of the tendon fibers. Both cause similar pain, which is why imaging is important for accurate diagnosis.

Can an injection cure my bursitis?

A corticosteroid injection can resolve an acute episode of bursitis very effectively. However, if the underlying cause (impingement mechanics, scapular dysfunction) is not addressed through PT, symptoms are likely to recur.

Is subacromial bursitis serious?

It is painful but not dangerous. Most cases resolve with conservative care. The concern is that persistent bursitis and impingement can, over years, contribute to rotator cuff degeneration.

How long does subacromial bursitis take to heal?

Mild to moderate subacromial bursitis often improves significantly within 4–8 weeks with a combination of activity modification, anti-inflammatory medication, physical therapy, and occasionally a corticosteroid injection. Chronic or recurrent bursitis — particularly when related to a structural problem like a bone spur or partial rotator cuff tear — may take several months to fully resolve and occasionally requires surgery to create more space in the subacromial area. At MOS, we assess whether your bursitis is isolated or part of a broader shoulder problem to ensure we address the underlying cause rather than just the symptoms.

Does bursitis mean my rotator cuff is torn?

Not necessarily — subacromial bursitis can occur on its own as a result of overuse, poor posture, or repetitive overhead activity without any rotator cuff damage. However, bursitis and rotator cuff tears frequently coexist because an inflamed or thickened bursa often develops in response to a torn tendon rubbing against the overlying bone. An MRI or diagnostic ultrasound can clearly differentiate between isolated bursitis and a rotator cuff tear. Your MOS shoulder specialist will use imaging and a thorough physical examination to determine whether the bursa is the primary problem or a secondary finding associated with tendon damage.