Shoulder impingement syndrome is painful compression of the rotator cuff tendons and subacromial bursa between the humeral head below and the bony roof of the shoulder above. It is one of the most common sources of shoulder pain in patients over 40 and a leading cause of rotator cuff tendon disease. Left unaddressed, the repetitive contact that drives impingement can progress to partial and full-thickness rotator cuff tears.
What Is Shoulder Impingement?
The subacromial space is the corridor between the humeral head and the coracoacromial arch, the bony-ligamentous roof formed by the acromion and the coracoacromial ligament. The supraspinatus tendon and subacromial bursa travel through this space with every overhead and reaching motion.
When the rotator cuff or scapular muscles are weak, injured, or poorly coordinated, the humeral head fails to stay well centered in the glenoid as the arm lifts. The humeral head migrates upward, narrowing the subacromial space and driving the rotator cuff tendons and bursa against the overlying arch. The repetitive contact inflames the tendons and bursa, which creates more pain and weakness, which in turn worsens the abnormal mechanics. The cycle perpetuates itself.
Over time, that chronic contact thins the rotator cuff tendon, leading to partial-thickness and eventually full-thickness tears. Impingement and rotator cuff disease are therefore part of a continuum rather than separate conditions.
Causes and Risk Factors
- Rotator cuff weakness or tendinopathy that allows the humeral head to ride high
- Scapular dyskinesis, in which abnormal shoulder blade motion narrows the subacromial space
- Posterior capsule tightness, which shifts the humeral head forward and upward
- Acromion shape, particularly a hooked (Type III) acromion
- Repetitive overhead work or sport such as painting, construction, swimming, and throwing
- Age over 40, with increasing prevalence through the sixth and seventh decades
Symptoms
- Pain on the outside of the shoulder and upper arm, worse with overhead activity
- Night pain that disrupts sleep, especially when lying on the affected side
- Pain arc between 60 and 120 degrees of arm elevation, often relieved at the top of the motion
- Weakness and pain with lifting and reaching
- Catching or painful clicking with specific movements
Diagnosis
Dr. Chudik’s evaluation includes the activity history, pain pattern, and a physical examination using provocative maneuvers (Neer, Hawkins-Kennedy, painful arc) that load the subacromial space and reproduce impingement pain. Specific strength testing isolates the rotator cuff tendons to identify associated tears. A subacromial lidocaine injection that relieves the pain helps confirm the diagnosis. X-rays evaluate acromion morphology, humeral head position, and any arthritic changes. MRI is obtained when a rotator cuff tear is suspected or when pain does not respond to non-surgical treatment. The Westmont office has on-site high-field MRI.
Treatment
Non-surgical management resolves symptoms for most patients and is the first line of treatment. It includes:
- Activity modification to reduce repetitive overhead loading
- Anti-inflammatory medication
- A targeted physical therapy program for rotator cuff and scapular stabilizer strengthening, posterior capsule stretching, and movement pattern retraining
- Subacromial corticosteroid injection when inflammation limits progress with therapy
Surgery is considered when symptoms persist despite at least three to six months of appropriate non-surgical care. Dr. Chudik performs arthroscopic subacromial decompression, shaving bone from the undersurface of the acromion and removing the inflamed bursa to widen the subacromial space. If the rotator cuff is torn, repair is performed at the same procedure.
Recovery and Outcomes
Recovery after arthroscopic subacromial decompression without cuff repair typically includes a few days in a sling for comfort, early active motion, and return to most daily activities within two to four weeks. Return to overhead work or sport is typically six to eight weeks. When rotator cuff repair is performed in the same procedure, recovery follows the longer rotator cuff repair timeline.
Outcomes are best when patients address the underlying movement dysfunction in rehabilitation rather than relying on surgery alone. Impingement driven by scapular dyskinesis that is never retrained tends to recur.
When to See Dr. Chudik
Schedule an evaluation if shoulder pain with overhead activity has persisted beyond a few weeks, if night pain is disrupting your sleep, or if prior treatment has failed. Call 630-324-0402 or request an appointment online.