How to Assess Shoulder Impingement: A Physiotherapist's Clinical Guide

Shoulder impingement is one of the most common presentations in musculoskeletal practice - and one of the most over-diagnosed. The term describes a symptom pattern, not a discrete pathology, and the structures involved (rotator cuff, subacromial bursa, long head of biceps, capsule) vary from patient to patient. The framework below walks through a clinically useful assessment built on hypothesis testing, not a checklist of provocation tests.

What 'impingement' actually means

Subacromial pain syndrome is the term increasingly preferred over 'impingement' because mechanical compression of the rotator cuff under the acromion is only one mechanism of pain. Many patients with imaging-confirmed cuff changes are asymptomatic, and many with classic impingement signs have no structural compression at all.

Practically: treat impingement as a working hypothesis describing painful arc with overhead loading, not as a diagnosis that dictates treatment. The real question is which tissues are sensitised and what movement patterns are driving the load.

Subjective screening: where the diagnosis is usually made

A careful history narrows the differential more than any special test. Ask about onset (insidious vs traumatic), aggravating positions (overhead, hand-behind-back, sleeping on the affected side), night pain, occupational and sporting load, and previous episodes.

Night pain that consistently wakes the patient and weakness disproportionate to pain are flags for a structural cuff tear rather than a reactive tendinopathy. Stiffness that exceeds pain - especially loss of passive external rotation - points toward frozen shoulder rather than impingement.

Physical examination: build a cluster, not a checklist

Begin with active range of motion in flexion, abduction, and hand-behind-back. A painful arc between roughly 60° and 120° of abduction supports a subacromial source. Then compare passive range - if passive range is full and pain-free where active range is painful, contractile structures are implicated; if both are limited, suspect capsular involvement.

Combine the Hawkins-Kennedy and Neer tests (sensitive, non-specific - useful for ruling out when negative) with a rotator cuff strength cluster (empty can, resisted external rotation, drop-arm). A positive painful arc plus positive Hawkins-Kennedy plus weakness or pain on resisted external rotation has substantially higher specificity than any test in isolation.

  • Painful arc 60–120° on active abduction.
  • Hawkins-Kennedy and Neer - for ruling out when negative.
  • Empty can (Jobe) - supraspinatus loading.
  • Resisted external rotation at 0° abduction - infraspinatus.
  • Drop-arm test - full-thickness supraspinatus tear screen.
  • Scapular assistance and reposition tests - does correcting scapular position change symptoms?

Differential diagnosis: what else looks like impingement

Cervical radiculopathy referring to the shoulder, frozen shoulder in its early painful phase, AC joint pathology, glenohumeral instability with secondary impingement, and labral tears can all present with a painful arc and positive Hawkins-Kennedy. Screen the cervical spine, test AC joint provocation (cross-body adduction, O'Brien), and assess for apprehension in younger patients with traumatic onsets before settling on a subacromial diagnosis.

When to image

Imaging is rarely needed at first presentation. Reserve ultrasound or MRI for patients who fail to respond to 6–12 weeks of structured loading, those with suspected full-thickness tears (significant weakness, night pain, traumatic onset over 40), or when surgical opinion is being considered. Incidental findings on imaging are extremely common and often unrelated to the patient's symptoms.

From assessment to plan

Translate your findings into a movement-based plan: progressive rotator cuff and scapular loading, modification of provocative positions in the short term, and a clear loading dose the patient can self-monitor. If your assessment identified scapular dyskinesis or thoracic stiffness as contributors, address them in parallel - but make the loading programme the centrepiece. Exercise therapy outperforms surgery for most subacromial pain at 12 and 24 months.

Key takeaways

  • Impingement is a syndrome describing a symptom pattern - not a diagnosis.
  • Subjective history narrows the differential more than any provocation test.
  • A painful arc plus Hawkins-Kennedy plus resisted external rotation pain is a useful cluster.
  • Screen the cervical spine, AC joint, and instability before settling on a subacromial diagnosis.
  • Progressive loading outperforms surgery for most subacromial pain at 1–2 years.

Frequently asked questions

What is the best test for shoulder impingement?

There is no single best test. The Hawkins-Kennedy and Neer tests are sensitive but not specific - they are most useful for ruling out subacromial involvement when negative. Combining them with a painful arc and a rotator cuff strength cluster substantially raises specificity.

How long does shoulder impingement take to recover?

Most patients improve substantially over 6–12 weeks of progressive loading. A subset takes longer, particularly when symptoms have been present for over a year, when there is significant deconditioning, or when load management at work or sport is not addressed alongside the exercise programme.

Should I get an MRI for shoulder impingement?

Imaging is rarely needed at first presentation. Reserve MRI or ultrasound for patients who fail a structured loading programme, those with suspected full-thickness tears, or when surgical opinion is being considered. Incidental findings on imaging are common and often unrelated to symptoms.