Shoulder Impingement: What It Is, and What You Can Do About It

Shoulder pain is one of the most common reasons people seek orthopaedic advice. If you've noticed pain when lifting your arm overhead, reaching behind your back, or carrying bags — shoulder impingement may be the cause.

What is shoulder impingement?

The shoulder is a remarkably mobile joint, but that flexibility comes with a trade-off. Between the top of the arm bone (the humeral head) and the bony arch above it (the acromion) runs the rotator cuff — a group of tendons that helps lift and rotate the arm. In this narrow channel sits a small fluid-filled cushion called the subacromial bursa.

Impingement occurs when these structures become pinched during arm movement, leading to irritation, inflammation, and pain. Over time, repeated irritation can damage the tendon itself.

Symptoms to look out for

• A dull ache on the outer or front of the shoulder, often worse at night

• Pain when raising the arm above shoulder height or reaching behind you

• Weakness when lifting or pushing

• A painful arc of movement — typically between 60° and 120° of elevation

What causes it?

Impingement can develop gradually from repetitive overhead activity (sport, manual work, desk posture), or following a change in shoulder muscle balance. Age-related changes in the tendon and bursa are also common contributors.

How is it treated?

The good news: the vast majority of patients improve without surgery.

Current evidence strongly supports a structured non-operative approach as first-line management

Physiotherapy is the cornerstone of treatment. A targeted programme focusing on rotator cuff strengthening and scapular control has been shown to produce outcomes equivalent to surgery in most patients.

Corticosteroid injection into the subacromial space can provide effective short-term pain relief, facilitating rehabilitation. It is most useful in the early, painful phase.

Activity modification — temporarily avoiding provocative movements — allows inflammation to settle without complete rest.

Surgery is reserved for cases where non-operative treatment has genuinely failed after 3–6 months. Arthroscopic subacromial decompression (keyhole surgery) is a day-case procedure with a return to normal activities typically within 6–12 weeks.

Recovery

Most patients see meaningful improvement within 6–12 weeks of a structured physiotherapy programme. Full recovery may take 3–6 months. Early engagement with rehabilitation — rather than waiting — is associated with better outcomes.

If you are experiencing shoulder pain and would like an expert assessment, Mr Jamie A'Court offers consultations at The Beaumont Hospital. Early diagnosis ensures the most appropriate treatment pathway is identified for you.