Shoulder impingement / rotator cuff injury

Shoulder impingement and rotator cuff injury are common causes of upper arm and shoulder pain. Many people notice pain reaching overhead, lifting away from the body, fastening a seatbelt, putting on a coat, training in the gym or sleeping on the affected side. In practice, several structures may be involved, including the subacromial bursa, rotator cuff tendons, long head of biceps, the acromioclavicular joint and, in some cases, associated shoulder stiffness.

What shoulder impingement / rotator cuff pain usually means

The term shoulder impingement is often used to describe pain arising when the tissues on the top and outer side of the shoulder become irritated and painful, especially during lifting or reaching. The term rotator cuff injury covers a wider range of problems including tendon overload, tendinopathy, bursitis, calcific change, partial tearing and more significant tears. These problems often overlap, which is why a full clinical assessment matters.

Common symptoms

• Pain lifting the arm overhead or out to the side
• Pain lowering the arm after reaching up
• Pain at night, especially when lying on the affected shoulder
• Difficulty with dressing, seatbelt use, coats, bras or reaching behind the back
• Pain into the upper outer arm rather than directly down into the hand
• Weakness, often because pain inhibits normal shoulder strength
• Pain during gym work, throwing, racket sport, manual work or repeated overhead activity

Why it happens

Shoulder pain can begin after a clear injury, but many cases develop progressively because the tendon and bursal tissues are being loaded more than they can currently tolerate. This may happen after repetitive work, an increase in gym training, racquet sports, DIY, painting, poor recovery, altered shoulder blade control or compensation after neck and thoracic stiffness. Age-related tendon changes can also make the cuff more sensitive to overload.

Clinical assessment

A premium shoulder assessment should not rely on one test or one scan finding alone. The most useful approach is to combine your history, movement assessment, strength testing, palpation and targeted imaging where it will change management.

• Clarify whether symptoms fit bursitis, rotator cuff tendinopathy, partial tear, frozen shoulder, AC joint pain or referred pain from the neck
• Assess active and passive range of motion
• Check cuff strength and control through different ranges
• Look at scapular movement, thoracic mobility and neck contribution
• Screen for more significant weakness or patterns suggesting a larger tear

How ultrasound can help

Ultrasound can be very useful in shoulder cases when it will improve diagnostic confidence or guide treatment. It can help identify:

• Subacromial bursitis
• Rotator cuff tendinopathy
• Calcific deposits
• Partial thickness tearing
• Biceps tendon sheath irritation
• Dynamic pain-sensitive tissue changes during movement

Importantly, some structural findings are common even in people without symptoms, so scan results must always be interpreted alongside pain behaviour, strength and function.

Typical ultrasound findings that may be seen

• Thickened or reactive supraspinatus tendon
• Subacromial bursal thickening or fluid
• Calcific tendinopathy
• Partial cuff tearing
• Biceps sheath fluid or tendon irritation

Treatment options

Treatment depends on the main pain driver. Most people improve with a combination of load modification, targeted rehabilitation and sensible progression back to function.

• Relative reduction of aggravating loading rather than total rest
• Progressive rotator cuff strengthening
• Scapular and thoracic movement retraining where relevant
• Manual therapy as an adjunct, not the whole plan
• Return-to-work, gym or sport-specific progression
• Injection only where clinically appropriate and after discussion of risks, benefits and alternatives

When injection may be appropriate

Injection may be considered when pain is highly irritable, disturbing sleep, preventing effective rehabilitation or limiting normal daily function. In shoulder pain this is commonly a subacromial bursa injection, although the exact target depends on the clinical picture and imaging findings. The aim is normally to reduce pain enough to allow better movement and progression of rehabilitation. It is not a substitute for strengthening, loading advice and follow-up management.

Who may not be suitable to inject on the day

• Current infection or cellulitis
• Uncontrolled diabetes or blood sugar concerns requiring extra review
• Recent vaccination timing issues where relevant
• Unclear diagnosis requiring further investigation
• Marked traumatic weakness suggesting a larger tear needing onward referral
• Patient preference not to proceed after discussing risks and alternatives

Expected recovery times

Recovery depends on whether the problem is mainly pain-sensitive bursitis, tendon overload, calcific change, stiffness or a tear-related weakness pattern.

• Milder overload presentations: may settle over several weeks with good load management and exercise
• More irritable bursitis / tendon pain: often takes longer and may benefit from injection to help rehabilitation progress
• Partial tears or more longstanding cuff problems: often require a longer strengthening programme over a number of months
• Traumatic larger tears: may need urgent onward imaging or specialist review

When urgent review is important

• Sudden traumatic loss of strength or inability to lift the arm
• Significant bruising after injury
• Red, hot swollen joint or fever
• Unexplained severe rest pain or progressive night pain
• Neurological symptoms such as marked arm weakness, numbness or symptoms tracking below the elbow that do not fit a straightforward shoulder presentation

Frequently asked questions

Book a shoulder assessment

If you have persistent shoulder pain, are unsure whether you need physiotherapy, diagnostic ultrasound or an injection, a targeted assessment can clarify the diagnosis and the most appropriate next step.