Shoulder Impingement

The shoulder is the most mobile joint in the body, allowing the arm to move in nearly every direction. This mobility, however, makes it more prone to instability and overuse injuries.

The shoulder joint consists of three main bones:

• The humerus (upper arm bone)
• The scapula (shoulder blade)
• The clavicle (collarbone)

The top of the humerus fits into a shallow socket in the scapula called the glenoid, forming the ball-and-socket joint. Surrounding this joint is a group of four muscles and their tendons known as the rotator cuff, which stabilize the shoulder and help lift and rotate the arm.

Above the rotator cuff lies the acromion, part of the shoulder blade that forms a roof over the joint. Between the acromion and the rotator cuff tendons is a small lubricating sac called the subacromial bursa. In a healthy shoulder, these structures move smoothly together. When swelling or structural changes reduce this space—such as bone spurs, poor posture, or muscular imbalance—impingement occurs.

Shoulder impingement is extremely common and affects people of all ages and activity levels. It accounts for a significant portion of shoulder pain seen in primary care and orthopedic offices.

Athletes and individuals who perform frequent overhead activities—such as swimmers, baseball players, tennis players, weightlifters, and painters—are especially at risk. However, it can also develop in non-athletes from everyday tasks like reaching, lifting, or working at a computer with poor posture.

In middle-aged and older adults, shoulder impingement may develop gradually as part of the natural aging process of the rotator cuff tendons. Over time, these tendons can weaken and thicken, increasing friction and inflammation beneath the acromion.

Diagnosis begins with a thorough medical history and physical examination. Dr. José Vega, Cleveland’s trusted shoulder specialist, will ask about your symptoms, activity level, and any injuries. During the exam, he’ll test shoulder strength, motion, and specific positions that reproduce pain to identify which structures are involved.

Imaging studies are often helpful:

• X-rays can show bone alignment, acromion shape, and bone spurs that may contribute to impingement.
• Ultrasound or MRI can evaluate the soft tissues—particularly the rotator cuff tendons and bursa—to detect inflammation, partial tears, or other associated problems.

Most cases of shoulder impingement can be successfully treated without surgery. Early intervention focuses on reducing inflammation, restoring proper shoulder mechanics, and preventing further tendon irritation.

Nonsurgical treatment options may include:

• Activity modification: Avoiding repetitive overhead motion or heavy lifting until pain improves.
• Anti-inflammatory medications: Short-term use of NSAIDs can help reduce pain and swelling.
• Physical therapy: A targeted exercise program is key to recovery. Therapy focuses on improving posture, strengthening the rotator cuff and shoulder blade muscles, and restoring proper motion and stability.
• Corticosteroid or biologic injections: In some cases, these may be recommended to reduce inflammation in the subacromial space.

If pain persists despite conservative care or if there is significant structural narrowing, arthroscopic surgery may be considered. This minimally invasive procedure allows Dr. Vega to remove inflamed tissue, smooth bone spurs, and create more space for the rotator cuff to move freely—often called a subacromial decompression. Recovery usually involves a short course of physical therapy to regain strength and mobility.

While not all cases can be prevented, maintaining good shoulder health can greatly reduce the risk. Key preventive measures include:

• Postural awareness: Keeping the shoulders back and chest open helps maintain space for the rotator cuff tendons.
• Strengthening exercises: Regularly strengthening the rotator cuff and shoulder blade muscles provides better joint control.
• Flexibility training: Stretching the chest and shoulder muscles prevents tightness that can alter joint mechanics.
• Gradual progression in activity: Increase training intensity slowly to avoid overuse injuries.
• Ergonomic adjustments: Setting up your workspace to avoid prolonged shoulder elevation or slouching can reduce strain.

Early attention to shoulder discomfort—rather than ignoring pain—can prevent minor inflammation from progressing to a more serious injury.