Shoulder impingement is a condition in which soft tissue structures inside the shoulder — typically the rotator cuff tendons or the bursa — are compressed between the bones of the joint during arm movement, producing pain and limiting how high and how freely the arm can move.
What shoulder impingement involves and how it develops
The shoulder is designed with a narrow space beneath the bony arch of the acromion — the part of the shoulder blade that forms the roof of the joint. The rotator cuff tendons and a fluid-filled cushion called the subacromial bursa occupy this space. When the shoulder mechanics are working well, everything glides smoothly.
When they're not — because the muscles that center the humeral head in the socket are weak or poorly coordinated, because posture has changed the angle of the joint, or because inflammation has thickened the bursa — the tendons and bursa get compressed with certain arm positions. Shoulder impingement typically produces pain when reaching overhead, reaching behind the back, or lifting the arm through a specific arc — often between 60 and 120 degrees of elevation. It's one of the most common causes of shoulder pain in adults and responds well to targeted rehabilitation in most cases.
Why shoulder impingement is often overtreated or undertreated
Some people push through shoulder impingement until the rotator cuff tendons are significantly damaged; others move toward surgery before giving rehabilitation a genuine chance. Shoulder impingement caused by muscle weakness and altered mechanics — not by structural narrowing of the joint — typically resolves fully with physical therapy alone.
Why rest and injections don't fix the underlying cause
Reducing inflammation through rest or corticosteroid injection can quiet the pain temporarily, but the mechanical factors that caused the impingement — weak rotator cuff, poor scapular control, forward shoulder posture — remain. Without addressing those, the same loading pattern continues and symptoms return. A physical therapist can identify and treat the specific deficits driving your shoulder impingement.
How Sword Health can help
A physical therapist can assess your shoulder mechanics, identify what's allowing impingement to occur, and build a targeted strengthening and movement program to resolve it. Sword makes that care available from home, with clinical expertise guiding every stage of your recovery.
About the author
Carolina Moreira
Medical Director of Clinical Development at Sword Health
