Shoulder impingement syndrome is one of the most common causes of shoulder pain. In other words, this condition is also known as shoulder impingement. In recent years, it has also been referred to as subacromial impingement syndrome.
Shoulder impingement occurs particularly when the arm is raised above shoulder level. It involves one of the four rotator cuff tendons—specifically, the supraspinatus tendon—becoming compressed under the bony structure called the acromion. Repetitive or prolonged compression leads to inflammation and swelling of the shoulder bursae, causing pain.
What Is Shoulder Impingement Syndrome?
Shoulder impingement syndrome develops when the soft tissues in the shoulder joint become compressed. It typically causes pain and restricted motion. One of the hallmark signs is pain felt when lifting or straining the arm. Repetitive shoulder movements and poor posture may trigger this condition.
The supraspinatus tendon—part of the rotator cuff—passes beneath the acromion bone located at the top of the shoulder. In some individuals, the space between the acromion and the humeral head (the subacromial space) is narrower than normal.
In these cases, particularly during forward and overhead arm movements, the rotator cuff tendon and the bursae (which act as natural cushions in the joint) can become compressed.
Repeated arm motions may cause the tendons and bursae to become inflamed, swollen, or even torn—resulting in shoulder pain and weakness.
What Causes Shoulder Impingement?
People who frequently perform overhead arm movements during work or sports are at higher risk of developing shoulder impingement. Swimmers and overhead athletes are particularly prone to this condition, often referred to as “swimmer’s shoulder.”
Other causes include direct trauma to the shoulder, osteoarthritis, structural abnormalities of the acromion, and weak rotator cuff muscles.
Bigliani Classification of Acromion Types:
- Type I: Flat acromion
- Type II: Curved acromion
- Type III: Hooked acromion
Where Does the Pain Radiate?
Shoulder impingement pain typically begins in the shoulder and may radiate down the arm, sometimes reaching the fingertips. This pain can be sharp and stabbing, severely affecting daily activities. In some cases, nerve compression may also cause the pain to extend to the neck and upper back.
Symptoms of Shoulder Impingement
Most patients with shoulder impingement report persistent shoulder pain, especially worsening at night and impairing sleep quality. Pain is often felt on the outer upper arm and the front of the shoulder, and increases with overhead activity. Weakness is another common symptom.
Common symptoms include:
- Sharp pain in the shoulder
- Radiating pain down the arm
- Numbness and tingling
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Why Does Shoulder Impingement Happen?
The most common cause of shoulder impingement is overuse of the shoulder. Activities that require frequent overhead movements significantly increase the risk. Athletes, manual laborers, and even desk workers are often affected.
Additionally, anatomical variations, congenital abnormalities, and traumatic injuries can contribute. Age-related weakening of shoulder muscles and reduced tissue elasticity also increase the likelihood of impingement.
Common Causes of Shoulder Impingement:
- Repetitive overhead activities
- Trauma or injury
- Muscle weakening due to aging
- Poor posture or incorrect biomechanics
Who Is at Risk?
Shoulder impingement is common among physically active individuals. Swimmers, tennis players, and construction workers who perform repetitive motions are at higher risk. However, those with sedentary lifestyles and poor posture are not immune.
Elderly individuals are also at increased risk due to natural weakening of muscle tissue. Hormonal changes and joint health issues can further exacerbate the condition.
| Group | Risk Factor |
| Athletes | Repetitive motion |
| Desk workers | Poor posture |
| Older adults | Muscle weakness |
How Is Shoulder Impingement Diagnosed?
Shoulder impingement can often be diagnosed through physical examination. To assess the subacromial space, X-rays may be used, while ultrasound and MRI are preferred to evaluate the tendons and bursae.
Treatment of Shoulder Impingement Syndrome
Treatment depends on the severity of the symptoms and the underlying cause. The main treatment approaches we offer include:
- Non-surgical treatment
- Ultrasound-guided injections
- Surgical intervention
Non-Surgical Treatment for Shoulder Impingement
Non-operative treatments are often effective for many patients. Rest, activity modification, and anti-inflammatory medications are typically the first steps to reduce pain and inflammation.
A physical therapy program focusing on range-of-motion and strengthening exercises can alleviate symptoms and often eliminate the need for surgery.
Ultrasound-Guided Injections
If symptoms persist despite initial treatments, corticosteroid injections may be administered into the subacromial space.
Compared to the traditional “blind” posterior approach, the anterior ultrasound-guided injection technique shows significantly better outcomes.
Surgical Treatment for Shoulder Impingement
If a bony spur or a thickened acromion is causing the impingement, arthroscopic shoulder surgery may be recommended. The bone spur is shaved, and inflamed bursae are removed. Any concurrent rotator cuff tear is also repaired.
For more detailed information on shoulder impingement surgery, read this article.
Physical Therapy for Shoulder Impingement
Shoulder impingement is frequently managed with physical therapy (PT). PT aims to strengthen the shoulder muscles and improve joint mobility.
During treatment, patients learn how to optimize shoulder movements and reduce impingement. Physical therapy is also effective in relieving pain and nerve compression. Regular PT sessions play a critical role in restoring shoulder function.
Shoulder Impingement Exercises
These exercises aim to strengthen the shoulder muscles, enhance flexibility, and improve shoulder stability. Common exercises include shoulder rotations, external rotation drills, dumbbell presses, and scapular stabilization exercises—ideally under physiotherapist supervision.
Other Recommended Exercises:
- Pendulum and circular arm swings
- Finger wall-walking
- Stretching and mobility drills
- Resistance band exercises
Medications for Shoulder Impingement
Medications typically aim to reduce pain and inflammation. Non-steroidal anti-inflammatory drugs (NSAIDs) and corticosteroid injections are commonly prescribed. All medication treatments should be administered under medical supervision.
Can Shoulder Impingement Heal on Its Own?
Shoulder impingement symptoms may improve with rest and exercise in some cases, but spontaneous recovery is rare. Because the root of the issue often lies in structural problems, surgical intervention is sometimes required.
Conclusion
Shoulder impingement syndrome—also referred to as subacromial impingement—accounts for 50-60% of all shoulder pain cases. Most cases respond well to non-surgical treatment methods.
In treatment-resistant cases, ultrasound-guided injections into the subacromial space yield promising results.
If all conservative approaches fail, arthroscopic shoulder surgery (arthroscopic subacromial decompression) may be performed. This minimally invasive procedure uses 2-3 small incisions (1 cm each) around the shoulder joint and typically offers excellent outcomes.
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