Subacromial impingement syndrome

SUBACROMIAL IMPINGEMENT SYNDROME

Subacromial impingement syndrome is one of the most common causes of shoulder pain. It describes a condition in which the structures in the subacromial space – mainly the rotator cuff tendons and the subacromial bursa – are repeatedly compressed or “impinged” during arm elevation, leading to irritation, inflammation, pain and movement difficulties. Pain is typically felt over the anterolateral aspect of the shoulder and is worse when lifting the arm to the side or overhead, such as when dressing, hanging washing or reaching to a high shelf. Modern guidelines often use the broader term “subacromial pain syndrome” because symptoms can arise from several interacting factors, not just a simple mechanical impingement.

How subacromial impingement causes shoulder pain

In subacromial impingement syndrome the subacromial space – the area between the humeral head and the acromion – becomes functionally narrowed, so that the rotator cuff tendons and subacromial bursa are subjected to increased compression during arm elevation. This can be related to bony factors, soft-tissue thickening or, more commonly, to functional issues such as altered scapular mechanics, muscle imbalance and repetitive overhead use in work or sports.

Patients typically report anterolateral shoulder pain when lifting the arm, often with a “painful arc” between about 60° and 120° of abduction or flexion, which may limit work, sport and self-care tasks. Symptoms can be accompanied by night pain and a feeling of catching or weakness. Diagnosis is clinical, based on the pattern of pain, a combination of impingement tests and exclusion of other causes, with imaging used selectively to assess associated rotator cuff or bursal pathology.

From pain to strength

In subacromial impingement syndrome physiotherapy plays a central role, as current guidelines emphasize conservative care with exercise and education rather than routine decompression surgery. A structured rehabilitation plan initially focuses on reducing pain by modifying aggravating activities, using gentle symptom-relieving techniques and encouraging comfortable movement within tolerance. As symptoms settle, treatment progresses to scapular control, rotator cuff and trunk strengthening and retraining how you lift and use your arm during daily activities.

Your physiotherapist will also help you identify postures and tasks that narrow the subacromial space and suggest alternative strategies so that work, household and sporting activities place less stress on the shoulder. Over time, specific alignment drills, scapular stabilization and progressive strengthening at different angles are introduced to increase your shoulder’s capacity for overhead movement without triggering pain. Regular review and adjustment of the programme to your goals and response are key to making rehabilitation safe, realistic and functional.

Frequently Asked Questions

What are the most common symptoms?
Pain over the anterolateral shoulder when lifting the arm, a painful arc of movement and sometimes night pain when lying on that side.
What causes subacromial impingement syndrome?
It is commonly associated with repetitive overhead use, altered scapular mechanics, muscle imbalance and age-related changes in the shoulder.
Is it the same as a rotator cuff tear?
No, they can overlap but subacromial impingement describes pain from the subacromial region, which may or may not include a rotator cuff tear.
What is the role of physiotherapy?
Physiotherapy reduces pain, improves scapular control and strengthens the rotator cuff so the shoulder can better tolerate movement and lo
Is it normal for the pain to appear only in a certain arc?
Yes, a “painful arc” in the middle of arm elevation is a typical finding in subacromial impingement.
What can I do myself to help my shoulder?
Avoid repeated painful overhead tasks, adjust your environment so frequent activities occur at a lower level and follow your prescribed exercise routine.
Can subacromial impingement become chronic?
Yes, symptoms can persist or recur if loading factors are not addressed and a consistent rehabilitation plan is not followed.
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