Shoulder Tendonitis: Causes, Diagnosis, and a Practical Path to Recovery

What Is Shoulder Tendonitis

Shoulder tendonitis refers to irritation and degeneration of one or more tendons in the shoulder joint, most often those of the rotator cuff — the group of four muscles and tendons that stabilize the humeral head within the shoulder socket. The supraspinatus tendon, which runs between two bony surfaces and is the most vulnerable to impingement, is involved in the majority of cases. The biceps tendon is another frequent site.

Tendonitis does not always involve true inflammation in the classical sense. In many patients, particularly those with symptoms lasting more than a few weeks, histologic analysis of the tissue shows degenerative changes — disorganized collagen, increased vascularity, and cell death — rather than an inflammatory cell infiltrate. Clinicians sometimes use the term "tendinopathy" to capture this broader picture. Practically, the distinction matters because pure anti-inflammatory treatment (ice, NSAIDs) has less impact on degenerative tendon disease than on acute inflammation.

Overhead athletes, manual laborers, and adults over 40 are at highest risk. Poor posture — rounded shoulders, a forward head position — reduces the space available for the tendons to move during arm elevation and accelerates mechanical wear.

Symptoms and How the Diagnosis Is Made

A dull ache deep in the shoulder that worsens with overhead reaching, lifting, or sleeping on the affected side is the typical presentation. Pain may radiate into the upper arm. Active shoulder elevation is often more painful than passive movement, and there may be a specific painful arc — usually between 60 and 120 degrees of abduction — where the tendon is impinged beneath the acromion.

Your physician will assess range of motion and strength in all planes and perform provocative tests to implicate specific structures. Imaging typically begins with plain X-rays to evaluate bony architecture and look for calcific deposits within the tendon. Ultrasound provides dynamic assessment of tendon integrity and can identify partial-thickness tears. MRI offers the most complete soft tissue characterization when the diagnosis is uncertain or when surgery is being considered.

A Stepwise Approach to Treatment

Activity modification is the starting point. Temporarily reduce or eliminate the overhead activities driving your symptoms. This does not mean abandoning exercise; it means substituting movements that keep your arm below shoulder height while the tendon recovers.

Physical therapy is the most effective non-operative treatment for shoulder tendinopathy. A well-designed program targets both rotator cuff strengthening — particularly the infraspinatus and teres minor, which control humeral head depression — and the periscapular musculature, which positions the shoulder blade to maintain adequate subacromial space during arm movement. Expect to spend at least six to twelve weeks in a supervised program before drawing conclusions about its effectiveness.

Corticosteroid injections into the subacromial bursa or the affected tendon sheath provide targeted anti-inflammatory relief and can allow more comfortable participation in physical therapy. They are most useful when acute pain is severe enough to prevent engagement with rehabilitation. Repeated injections — more than two or three — are generally avoided because of the potential for tendon weakening.

PRP (platelet-rich plasma) injections have generated interest as a treatment for degenerative tendinopathy. PRP is prepared from the patient's own blood and concentrated to deliver growth factors that may stimulate tendon repair. Evidence for rotator cuff tendinopathy is still evolving, and patient selection matters; your surgeon can help determine whether this option is appropriate for your situation.

Arthroscopic surgery is indicated when a patient has engaged in at least three to six months of structured conservative treatment without adequate improvement, or when imaging reveals a partial- or full-thickness tear that is unlikely to heal without intervention. Arthroscopic subacromial decompression and tendon repair are reliable procedures with high patient satisfaction rates and relatively short recovery timelines.

Preventing Recurrence

Restoration of normal shoulder mechanics — through continued rotator cuff strengthening, attention to posture, and sport- or work-specific training modifications — is what prevents tendonitis from recurring after treatment. A physical therapist can teach you a long-term home maintenance program before you are discharged from formal therapy.

If you're experiencing persistent shoulder pain that hasn't improved with rest, the specialists at Maryland Orthopedic Specialists can help. Call (301) 515-0900 or [schedule an appointment online](https://www.mdorthospecialists.com/contact).