Shoulder Bursitis (Subacromial Bursitis & Rotator Cuff Tendinopathy)

Shoulder bursitis is one of the most common sources of shoulder pain in adults over 40, and a frequent cause of overhead pain in athletes and overhead workers of any age. At Modal Pain Management in Midtown Manhattan, Dr. Alex Movshis diagnoses it by history and examination, uses imaging when the exam calls for it, and places injections under real-time ultrasound so the needle can be seen reaching the bursa, the tendon sheath or the joint. Most people go back to work the next day after an injection. How fast the shoulder recovers depends far more on the exercise program that follows than on the injection itself.

This page covers what shoulder bursitis actually is (it is rarely just bursitis — it is usually rotator cuff tendinopathy with the bursa inflamed secondarily), how it is distinguished from the other causes of shoulder pain (rotator cuff tear, frozen shoulder, AC joint disease, glenohumeral OA, cervical radiculopathy), how it is diagnosed at Modal Pain Management, and the evidence-based image-guided treatment ladder we use to get patients back to overhead activity, side-sleeping, the gym, and their sport without pain.

Shoulder Bursitis Is Usually Tendinopathy: The Modern Paradigm

For decades the standard diagnosis for chronic shoulder pain was “subacromial bursitis” — and the standard treatment was a cortisone injection into the bursa. Modern imaging changed that. Current thinking is that isolated bursal inflammation is the exception. Most people with classic “shoulder bursitis” symptoms have tendinopathy of the rotator cuff — most often the supraspinatus tendon at its insertion on the greater tuberosity of the humerus — with the subacromial bursa irritated secondarily because it sits in the same narrow space between the rotator cuff below and the acromion above (Lewis 2010).

Because the cuff tendon is the primary pain generator in most cases, the umbrella terminology has shifted to “subacromial pain syndrome” or “rotator cuff related shoulder pain (RCRSP)” in the academic literature — but most patients (and most search engines) still know the condition as “shoulder bursitis,” “subacromial bursitis,” or “rotator cuff tendinitis.”

This terminology change has clinical consequences. A purely bursa-focused treatment plan (rest plus repeated cortisone injections) does not address the underlying rotator cuff tendinopathy, and repeated steroid may weaken tendon tissue. The image-guided ladder we use at Modal Pain Management explicitly accounts for the bursal versus tendinous components and selects treatments accordingly.

The four overlapping conditions that fall under the shoulder bursitis / subacromial pain umbrella are:

• Subacromial bursitis (true bursal inflammation) — fluid distension of the subacromial-subdeltoid bursa, often secondary to underlying cuff tendinopathy or impingement.
• Supraspinatus tendinopathy — degenerative disease of the supraspinatus tendon at the greater tuberosity insertion. The most common driver of subacromial pain.
• Partial-thickness rotator cuff tears — articular-side, bursal-side, or intratendinous. They often coexist with tendinopathy and are usually managed with the same conservative program.
• Subacromial impingement syndrome (mechanical) — narrowing of the subacromial space (anatomic or postural) that produces compression of the supraspinatus and bursa with arm elevation.

Working out which of these is dominant, and treating accordingly, is how to avoid the “I keep getting cortisone shots that don’t last” pattern.

Why It Hurts in the Shoulder: The Anatomy

The shoulder is the most mobile joint in the body, and that mobility is bought at the cost of stability. Several structures share a tight space called the subacromial space, which sits between the curved undersurface of the acromion above and the rotator cuff tendons (covering the head of the humerus) below:

• The supraspinatus tendon runs through the subacromial space to insert on the greater tuberosity of the humerus. It helps start lifting the arm out to the side and is the most commonly injured rotator cuff tendon.
• The infraspinatus and teres minor tendons insert just behind the supraspinatus on the greater tuberosity and produce external rotation of the shoulder.
• The subscapularis tendon wraps around the front of the humerus to insert on the lesser tuberosity and produces internal rotation. It sits in front, slightly outside the classic “subacromial” zone.
• The subacromial-subdeltoid bursa is a fluid-filled sac that sits between the rotator cuff (below) and the deltoid muscle and acromion (above). Its job is to allow the cuff tendons to glide smoothly under the acromion during overhead motion.
• The long head of the biceps tendon passes through the rotator interval and the bicipital groove at the front of the shoulder. It is a frequent secondary pain generator in chronic shoulder problems.
• The acromioclavicular (AC) joint sits at the very top of the shoulder. Its undersurface forms part of the roof of the subacromial space, and AC arthritis with bone spurs underneath can contribute to pain.

When the supraspinatus tendon degenerates (tendinopathy) it swells, loses its normal smooth gliding surface, and the subacromial bursa above it inflames secondarily. The combination produces the classic “painful arc” pattern: pain that begins around 60° of abduction, peaks around 90–120°, and may ease above 120°. Sleep on the affected side compresses the entire subacromial complex against the mattress and is one of the most reliable triggers of night pain.

Shoulder Bursitis vs. Other Causes of Shoulder Pain

Telling shoulder bursitis apart from other causes of shoulder pain matters because the treatment for each is different, and a missed full-thickness rotator cuff tear or referred neck pain will not improve with subacromial injections. How the five main shoulder patterns are sorted, and which procedure each one gets, is laid out on our shoulder pain page. The most common diagnostic mimics:

1. Rotator cuff tear (partial vs. full thickness) — partial tears often respond to the same conservative ladder used for tendinopathy. Symptomatic full-thickness retracted tears in active patients are often considered for arthroscopic repair before fatty change sets into the muscle. Ultrasound or MRI grades the tear when the exam suggests one.
2. Adhesive capsulitis (frozen shoulder) — characterized by progressive loss of both active and passive range of motion (especially external rotation). True bursitis preserves passive range. Frozen shoulder is more common in people with diabetes and in women aged 40–65. Watch the 45-second frozen shoulder mechanism animation to see what is actually stuck.
3. Glenohumeral osteoarthritis — pain is felt deep in the joint, worsens with all motion (not just overhead), and produces grinding crepitus. Plain X-rays are diagnostic.
4. Acromioclavicular (AC) joint pain or arthritis — point tenderness directly on top of the AC joint, pain with cross-body adduction (the AC compression test), and pain with bench press or overhead press at the very top of the lift. Often coexists with subacromial pain.
5. Biceps tendinopathy or SLAP (superior labral) tear — anterior shoulder pain, pain with resisted elbow flexion or supination (Speed’s and Yergason’s tests), and pain with overhead loaded activities.
6. Cervical radiculopathy — pain that originates in the neck and radiates down the arm past the elbow, with numbness/tingling and possible weakness in a dermatomal/myotomal pattern. See our neck pain page. It commonly mimics or coexists with shoulder pain and is missed on shoulder-only workups.
7. Calcific tendinopathy — acute, often severe shoulder pain without trauma, with calcium deposits visible on plain X-ray or ultrasound within the rotator cuff tendons. In a randomized trial, ultrasound-guided barbotage (needling and lavage) plus a steroid injection gave better function at one year than the steroid injection alone (de Witte 2013). Barbotage requires referral, because Modal Pain does not perform it.
8. Septic bursitis or septic arthritis — warm, red, swollen shoulder with fever and severe pain at rest. This is an emergency: call 911 or go to the nearest emergency room.

A focused history and examination narrows these down at the first visit, with X-ray, ultrasound or MRI added when the exam calls for it. No single exam test is decisive on its own (Hegedus 2012).

How Shoulder Bursitis Is Diagnosed at Modal Pain Management

Shoulder bursitis is a clinical diagnosis, supported by imaging when needed. Dr. Movshis’s evaluation covers:

• Targeted history — onset, painful arc pattern, night pain, side-sleeping intolerance, overhead loading provocation, occupational and athletic exposures, prior cortisone injections and their duration of benefit, prior surgery, diabetes, and a brief screen for cervical pain and radicular symptoms.
• Physical examination — observation of scapular kinematics with shoulder elevation, palpation of the AC joint and the bicipital groove, active and passive range of motion in all planes, and a battery of provocative tests: Neer impingement test, Hawkins-Kennedy test, painful arc test, empty-can (Jobe) test for the supraspinatus, external rotation lag sign for the infraspinatus, lift-off and belly-press tests for the subscapularis, Speed’s and Yergason’s tests for the biceps, AC joint compression test, and Spurling’s test for cervical radiculopathy.
• Diagnostic ultrasound — when the exam calls for it, real-time imaging of the supraspinatus, infraspinatus, subscapularis, biceps tendon, subacromial bursa, AC joint, and the motion of the cuff under the acromion with arm elevation. It can show tendinopathy, partial- and full-thickness tears, bursal fluid and calcific deposits.
• Plain X-rays — when indicated, to assess acromial morphology (Bigliani type I, II, III), AC joint arthritis, glenohumeral OA, calcific deposits, and to rule out fracture in trauma cases.
• MRI (or MR arthrogram) — reserved for cases where ultrasound is equivocal, where surgical repair is being considered, or where additional pathology (labral tear, intra-articular biceps pathology, complex full-thickness tear sizing) needs to be characterized before treatment planning.

Imaging findings are common in shoulders that do not hurt. In one MRI study of 96 people without symptoms, 34% had a rotator cuff tear, rising to 54% in those over 60 (Sher 1995). That is why the exam leads and imaging is read alongside it, and why most patients leave the consultation with a working diagnosis and a treatment plan.

The Image-Guided Treatment Ladder for Shoulder Bursitis

Treatment is matched to the dominant pain generator and the chronicity of the problem. The four-step ladder:

Step 1 — Load management plus structured physical therapy. The first-line treatment for subacromial pain is a graded rotator cuff and shoulder blade loading program, paired with avoiding the aggravating overhead pattern and changing sleep posture. The Cochrane review found that exercise-based physical therapy may give results similar to steroid injection and to decompression surgery, though the evidence was low quality (Page 2016). Surgery has not done better: in the CSAW trial, decompression surgery was no better than placebo arthroscopy (Beard 2018). For atraumatic full-thickness tears, about three-quarters of patients in the MOON cohort avoided surgery over two years with a structured physical therapy program (Kuhn 2013). Modal’s in-house physical therapists, on the same floor, follow this evidence: scapular control, posterior capsule mobility, eccentric loading of the cuff, and sport- or work-specific reintroduction. See our physical therapy page.

Step 2 — Ultrasound-guided subacromial corticosteroid injection. For bursa-dominant inflammation and for patients who need rapid functional improvement (an upcoming event, a work deadline, or an inability to sleep that is breaking down their ability to engage in PT), an ultrasound-guided subacromial corticosteroid injection usually gives fast short-term relief. The injection is placed under direct ultrasound visualization into the subacromial bursa, between the cuff below and the acromion above, with no contact with the cuff tendon. For the subacromial space specifically, the one accuracy study found no clear difference between ultrasound and landmark guidance, but three trials found more pain relief and better function at six weeks with ultrasound guidance (Aly 2015, Ucuncu 2009). Most patients feel improvement within days. Repeat injections at the same site are kept to a minimum and spaced at least 3 months apart, because repeated steroid exposure may weaken the rotator cuff tendons.

Step 3 — Ultrasound-guided PRP injection of the supraspinatus tendon. For chronic, tendinopathy-dominant cases, for partial-thickness tears seen on imaging, and for patients who have already had one or two cortisone injections without lasting relief, ultrasound-guided PRP (platelet-rich plasma) is an option to discuss. PRP delivers a concentrated dose of platelets and their growth factors directly to the degenerated tendon, with the aim of a repair response. Onset is slower than cortisone, and the trial evidence in the rotator cuff is weak. In a placebo-controlled trial of 40 patients, PRP was no better than saline at 1 year in chronic rotator cuff tendinopathy when both groups did an exercise program (Kesikburun 2013). A 39-patient trial found PRP better than dry needling, which is not a placebo, from 6 weeks to 6 months (Rha 2013). PRP avoids adding more steroid to the area, which is why it is offered, self-pay, to patients who would otherwise be heading toward another steroid injection, after a frank talk about that evidence. Aftercare, including 2 weeks without anti-inflammatories before and after, is on the PRP aftercare page.

Step 4 — Surgical referral. Reserved for symptomatic full-thickness, retracted, or enlarging rotator cuff tears in surgical candidates who have not improved with a proper conservative course. Younger active patients with acute traumatic tears are referred early, because repair is favored before fatty change sets into the muscle. Refractory cases with clear structural damage, after conservative care has been exhausted, are referred as well. Modal Pain Management refers these patients to shoulder surgeons in Manhattan.

For acute calcific tendinopathy (a distinct entity within the shoulder pain umbrella, with characteristic calcium deposits visible on X-ray or ultrasound), ultrasound-guided barbotage (needling and lavage of the calcium) is a non-surgical option. In a randomized trial of 48 patients it gave better shoulder function at one year than a steroid injection alone (de Witte 2013). Modal Pain Management does not perform barbotage and refers patients who need it.

Physical Therapy and Self-Care

The exercise and self-care backbone of shoulder bursitis recovery includes:

• Sleep posture modification — stop sleeping on the affected shoulder. Sleep on your back with a small pillow under the elbow to support the arm. If you must sleep on your side, use the unaffected side and hug a pillow in front to keep the affected arm slightly forward and supported.
• Posture correction — desk ergonomics that reduce forward-rounded shoulders and forward-head posture, periodic shoulder blade squeeze breaks, and thoracic mobility drills (foam roller thoracic extensions, open-book stretches).
• Activity modification — a temporary cut in overhead loading. Replace vertical pressing with landmine pressing and behind-the-neck pulldowns with neutral-grip dumbbell rows, reduce swim volume and work on body roll in freestyle, and for tennis or baseball, have the overhead motion assessed.
• Progressive rotator cuff loading — supervised progression from isometrics to light isotonics to loaded eccentrics for the supraspinatus, infraspinatus and subscapularis, serratus anterior and lower trapezius work for shoulder blade control, and posterior capsule mobility (sleeper stretch, cross-body stretch).
• Sport- or work-specific reintroduction — graded return to overhead loading with attention to scapular control and pain-monitoring rules.

This is not optional add-on care. It is the core of the treatment ladder, and patients who skip it are more likely to see the pain return after an injection wears off.

When Shoulder Pain Is an Emergency

Most shoulder pain is not an emergency. For the presentations below, call 911 or go to the nearest emergency room:

• Acute traumatic injury with immediate weakness or inability to move the arm — rule out acute rotator cuff tear, fracture, or dislocation.
• Visible deformity — rule out anterior or posterior shoulder dislocation, AC separation, or a “Popeye sign” of biceps tendon rupture.
• Warm, red, swollen shoulder with fever — possible septic bursitis or septic arthritis, which need urgent drainage and antibiotics.
• Sudden severe shoulder pain with chest pain, jaw pain, or shortness of breath — possible heart attack. Call 911.
• Rapidly worsening arm weakness with numbness — possible significant nerve root or spinal cord compression in the neck.

For non-emergent shoulder pain that has not responded to 1–2 weeks of conservative measures, schedule a same-week consultation with Modal Pain Management.

Why Modal Pain Management

Modal Pain Management at 369 Lexington Avenue, Floor 25, in Midtown Manhattan treats shoulder bursitis and rotator cuff tendinopathy conservatively first, with image guidance for every injection. What that looks like in practice:

• Image-guided injections, not landmark. Every subacromial injection at Modal Pain is performed under real-time ultrasound guidance, which was linked to better pain relief at six weeks than landmark injections (Aly 2015).
• PRP as an option, with honest evidence. PRP is offered for the cuff tendon component in chronic and recurrent cases, with a frank discussion of its weak evidence in the rotator cuff.
• Same-week new-patient appointments. Most patients are seen within the same week as their first call.
• Most commercial PPO plans accepted. These include Aetna, Anthem Blue Cross Blue Shield, Cigna, Empire Blue Cross Blue Shield, the Empire Plan, Oscar, Oxford, UMR and UnitedHealthcare. The practice does not accept Medicare, Medicaid, HMO plans, or workers’ compensation. We check your benefits and go over what your plan covers and any expected cost by phone before your visit, so there are no surprise bills. Verify your insurance.
• In-house physical therapy. Modal’s physical therapists work on the same floor and use progressive loading programs.
• Surgical referrals when appropriate. When a structural tear needs repair, you are referred to a shoulder surgeon. Surgery is not the default for a problem that usually responds to conservative care.

To book a shoulder pain evaluation, request a consultation online or call (646) 290-6660.

References

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• Hegedus EJ, Goode AP, Cook CE, et al. Which physical examination tests provide clinicians with the most value when examining the shoulder? Update of a systematic review with meta-analysis of individual tests. Br J Sports Med. 2012;46(14):964–78. doi:10.1136/bjsports-2012-091066 · PubMed
• Kuhn JE, Dunn WR, Sanders R, et al. Effectiveness of physical therapy in treating atraumatic full-thickness rotator cuff tears: a multicenter prospective cohort study. J Shoulder Elbow Surg. 2013;22(10):1371–9. doi:10.1016/j.jse.2013.01.026 · PubMed
• Page MJ, Green S, McBain B, et al. Manual therapy and exercise for rotator cuff disease. Cochrane Database Syst Rev. 2016;2016(6):CD012224. doi:10.1002/14651858.CD012224 · PubMed
• Beard DJ, Rees JL, Cook JA, et al. Arthroscopic subacromial decompression for subacromial shoulder pain (CSAW): a multicentre, pragmatic, parallel group, placebo-controlled, three-group, randomised surgical trial. Lancet. 2018;391(10118):329–338. doi:10.1016/S0140-6736(17)32457-1 · PubMed
• Aly AR, Rajasekaran S, Ashworth N. Ultrasound-guided shoulder girdle injections are more accurate and more effective than landmark-guided injections: a systematic review and meta-analysis. Br J Sports Med. 2015;49(16):1042–9. doi:10.1136/bjsports-2014-093573 · PubMed
• Ucuncu F, Capkin E, Karkucak M, et al. A comparison of the effectiveness of landmark-guided injections and ultrasonography guided injections for shoulder pain. Clin J Pain. 2009;25(9):786–9. doi:10.1097/AJP.0b013e3181acb0e4 · PubMed
• Kesikburun S, Tan AK, Yilmaz B, Yaşar E, Yazicioğlu K. Platelet-rich plasma injections in the treatment of chronic rotator cuff tendinopathy: a randomized controlled trial with 1-year follow-up. Am J Sports Med. 2013;41(11):2609–16. doi:10.1177/0363546513496542 · PubMed
• Rha DW, Park GY, Kim YK, Kim MT, Lee SC. Comparison of the therapeutic effects of ultrasound-guided platelet-rich plasma injection and dry needling in rotator cuff disease: a randomized controlled trial. Clin Rehabil. 2013;27(2):113–22. doi:10.1177/0269215512448388 · PubMed
• Sher JS, Uribe JW, Posada A, Murphy BJ, Zlatkin MB. Abnormal findings on magnetic resonance images of asymptomatic shoulders. J Bone Joint Surg Am. 1995;77(1):10–15. doi:10.2106/00004623-199501000-00002 · PubMed
• de Witte PB, Selten JW, Navas A, et al. Calcific tendinitis of the rotator cuff: a randomized controlled trial of ultrasound-guided needling and lavage versus subacromial corticosteroids. Am J Sports Med. 2013;41(7):1665–73. doi:10.1177/0363546513487066 · PubMed