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1 · SNAPSHOT

Subacromial Impingement / Subacromial Pain Syndrome (SAPS) body chart — Illustrative, not diagnostic. Canva body chart for Subacromial Impingement / Subacromial Pain Syndrome (SAPS).

Who: Anyone with repeated or sustained overhead load. Trades, swimmers, throwers, and desk-based workers with an overhead hobby.
What: Load-sensitive lateral shoulder pain with a mechanical component. Not a demonstrated pinch.
How it behaves: Lateral shoulder pain with overhead movement and reaching. A "pinching" sensation and a mid-range painful arc. Night pain lying on it. Eased by unloading the arm.

The one thing to take from this page:

"Impingement" names a presentation, not a mechanism. The tests don't identify the tissue, and the operation built on the pinching story doesn't beat placebo. So treat load, capacity and control — and watch your language.

Same patient, two labels

SAPS / "subacromial impingement"	RCRSP
The mechanical-compression subset	The broader umbrella
Same painful arc	Same painful arc
Same first-line management	Same first-line management

Treat it as one continuum. If you are arguing about which label to use, you are arguing about the wrong thing.

⚠️ The only Australian guideline is old: the RACGP- and APA-endorsed rotator cuff syndrome guideline for working adults names subacromial impingement, but predates everything below. Anchored to the JOSPT rotator cuff tendinopathy guideline, the BMJ Rapid Recommendation on decompression, and the Dutch guideline update.

2 · SE — THE SUBJECTIVE PATTERN (the 70%)

Five stages, in your course's order. The subjective does almost all of the work here, because the objective tests will not tell you which tissue it is.

MAIN PROBLEM

"It pinches when I reach up."
"I can't sleep on that side."
"Hanging the washing kills me."

BODY CHART

Chart interpretation: Subacromial pain and rotator cuff-related shoulder pain overlap clinically. These lessons explain terminology within a shared clinical approach; they do not identify two reliably separable diagnoses.

Lateral shoulder and deltoid insertion region. That is the pattern.
Below the elbow? Ask again. Distal symptoms open the cervical question.
Mark AC joint separately — point tenderness on top is a different page.
P1 on the way up, easing at the top is the arc, and it belongs on the chart.

BEHAVIOUR

	Fits SAPS	Points elsewhere
Aggs	Overhead, reaching, lying on it	Everything, including passive movement → capsular
Eases	Unloading the arm	Nothing eases it → reconsider
Arc	Mid-range painful arc, eases past it	Pain to the very end of range only → AC joint
Night	Lying on that side	Night pain unrelated to position → screen
24-hr	Stiff first thing, eases with movement, builds with a day of use	Constant, no good time of day → capsular or calcific
Severity	VAS 0–10 at best / at worst / right now	—
Coding	In / Is early, M as it settles	—

Irritability, all three parts: resting symptoms, the vigour needed to provoke it, and time to settle. It sets the dose, and on this page it is more useful than any test result.

HISTORY

What changed? A new job, a renovation, a return to swimming, a change in training volume.
Trauma? A traumatic onset with weakness is a different pathway.
Previous episodes, previous imaging, previous injections — and what was said at the time.
Ask what they were told. "Bone spur", "wearing away", "bone on bone" — this changes management, and it is the reason the language section exists.

SPECIAL / SCREENING QUESTIONS

Night pain that doesn't relate to position? Screen.
Systemic symptoms, unexplained weight loss, past cancer? Screen.
True weakness rather than painful weakness, especially after trauma?
Neck symptoms, distal symptoms, pins and needles?

Assessing this region? Download the Shoulder assessment template →

3 · HYPOTHESIS RANKING

Competing pattern	The one discriminating feature
RC-related shoulder pain	Not a competitor — the same continuum. SAPS has no universally accepted definition [1], so don't treat "mechanical-compression subset" as a proven category. One pathway, not two diagnoses.
Frozen shoulder	Passive range is lost too. If PROM is full, it isn't capsular.
Calcific tendinopathy	Acutely worse than usual. Very painful at rest and at night, guarded arm, marked pain-limited mid-range.
AC joint pain	Point tenderness on top, pain at end-range elevation and across the body rather than a mid-range arc.
Cervical referral	Symptoms below the elbow, neck-related behaviour, and the shoulder tests don't reproduce it.

The one that outranks the table

A full-thickness cuff tear after trauma. Traumatic onset with true weakness is a different pathway and a different urgency.

And the finding that should change how confidently you use this label

In a secondary-care cohort presenting with signs and symptoms of SAPS, roughly three in ten had a conflicting diagnosis — most commonly frozen shoulder [1]. That is a secondary-care sample, so the proportion won't transfer directly to your clinic. The behaviour it should change does: check passive range before you commit to the label.

4 · RED FLAGS — DON'T MISS THIS

This section is free, on every pattern, forever. Safety is never gated.

Finding	What it suggests	What you do
Night pain unrelated to position, not settling	Malignancy, infection	Medical review
Unexplained weight loss, fever, unwell	Systemic disease	Medical review
Past cancer with new shoulder pain	Metastatic disease	Medical review
Trauma with true weakness	Full-thickness cuff tear, fracture	Image. Orthopaedic review
Visible deformity or marked swelling	Structural	Image
Progressive weakness or wasting	Nerve involvement, large tear	Escalate
Left shoulder pain with exertion, breathlessness, sweating	Cardiac referral	Emergency
Referred pain not reproducible on movement testing	Visceral source	Medical review

The rule: pain that behaves with load and position, and moves when you change the load, is yours. Pain that doesn't care what you do to the shoulder isn't.

Cross-links: Rotator cuff–related shoulder pain · Adhesive capsulitis · ACJ injury and OA · Biceps tendinopathy

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Twelve slides on this pattern: what you'll hear, what to examine, what to do. Free with an account.

Guideline anchor

The only Australian guideline is old: the Clinical Practice Guidelines for the Management of Rotator Cuff Syndrome in the Workplace (UNSW Rural Clinical School, 2013; endorsed by RACGP, RANZCR, the APA and the ARA) names subacromial impingement and bursitis, but is written for working adults and predates the trials below.

Anchored to the JOSPT clinical practice guideline for rotator cuff tendinopathy (Desmeules et al. 2025, PMID 40165544) for diagnosis, imaging and first-line care; to the BMJ Rapid Recommendation on subacromial decompression (Vandvik et al. 2019, PMID 30728120) for the surgical question; and to the Dutch Orthopaedic Association guideline update, Part 1 (Lambers Heerspink et al. 2026, PMID 41718640) for the current non-surgical pathway.

PubMed Source

Apart from the 2013 workplace guideline, none of these is an Australian document. Two Australian-led studies inform the language section (Zadro et al. 2022, J Physiother) but neither is a guideline. The JOSPT guideline is written for rotator cuff tendinopathy, which overlaps this presentation rather than being named the same thing — which is itself the point of this page.

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The evidence summary is for members

Verified diagnostic accuracy, where the evidence stands and what it doesn't settle. Free with an account.

Sources · 19

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Every source on this page resolves and title-verifies against PubMed. Newest first.

2025Witten et al. (2025). The Challenge of Diagnosing Patients Presenting With Signs and Symptoms of Subacromial Pain Syndrome: A Descriptive Study of 741 Patients Seen in a Secondary Care Setting. Orthopaedic journal of sports medicine, 13(4), 23259671251332942. https://doi.org/10.1177/23259671251332942
2024Zhao et al. (2024). Evidence-based approach to the shoulder examination for subacromial bursitis and rotator cuff tears: a systematic review and meta-analysis. BMC musculoskeletal disorders, 25(1), 1028. https://doi.org/10.1186/s12891-024-08144-z
2019Innocenti et al. (2019). The management of shoulder impingement and related disorders: A systematic review on diagnostic accuracy of physical tests and manual therapy efficacy. Journal of bodywork and movement therapies, 23(3), 604-618. https://doi.org/10.1016/j.jbmt.2018.08.002
2026Lambers Heerspink et al. (2026). Update of guideline for diagnosis and treatment of subacromial pain syndrome: a multidisciplinary review by the Dutch Orthopedic Association Part 1: preventive measures, diagnostics, and non-surgical treatment of subacromial pain syndrome. Acta orthopaedica, 97, 91-98. https://doi.org/10.2340/17453674.2026.45365
2020Doiron-Cadrin et al. (2020). Shoulder Rotator Cuff Disorders: A Systematic Review of Clinical Practice Guidelines and Semantic Analyses of Recommendations. Archives of physical medicine and rehabilitation, 101(7), 1233-1242. https://doi.org/10.1016/j.apmr.2019.12.017
2025Desmeules et al. (2025). Rotator Cuff Tendinopathy Diagnosis, Nonsurgical Medical Care, and Rehabilitation: A Clinical Practice Guideline. The Journal of orthopaedic and sports physical therapy, 55(4), 235-274. https://doi.org/10.2519/jospt.2025.13182
2021Clausen et al. (2021). Effectiveness of Adding a Large Dose of Shoulder Strengthening to Current Nonoperative Care for Subacromial Impingement: A Pragmatic, Double-Blind Randomized Controlled Trial (SExSI Trial). The American journal of sports medicine, 49(11), 3040-3049. https://doi.org/10.1177/03635465211016008
2022Lyng et al. (2022). The influence of exercise on clinical pain and pain mechanisms in patients with subacromial pain syndrome. European journal of pain (London, England), 26(9), 1882-1895. https://doi.org/10.1002/ejp.2010
2018Cuff & Littlewood (2018). Subacromial impingement syndrome - What does this mean to and for the patient? A qualitative study. Musculoskeletal science & practice, 33, 24-28. https://doi.org/10.1016/j.msksp.2017.10.008
2022Zadro et al. (2022). Diagnostic labels and advice for rotator cuff disease influence perceived need for shoulder surgery: an online randomised experiment. Journal of physiotherapy, 68(4), 269-276. https://doi.org/10.1016/j.jphys.2022.09.005
2017Mohamadi et al. (2017). Corticosteroid Injections Give Small and Transient Pain Relief in Rotator Cuff Tendinosis: A Meta-analysis. Clinical orthopaedics and related research, 475(1), 232-243. https://doi.org/10.1007/s11999-016-5002-1
2026Versloot et al. (2026). Effectiveness of a corticosteroid injection versus exercise therapy for shoulder pain in general practice (SIX-Shoulder Study): A randomized controlled trial. Musculoskeletal science & practice, 82, 103497. https://doi.org/10.1016/j.msksp.2026.103497
2019Vandvik et al. (2019). Subacromial decompression surgery for adults with shoulder pain: a clinical practice guideline. BMJ (Clinical research ed.), 364, l294. https://doi.org/10.1136/bmj.l294
2018Beard et al. (2018). Arthroscopic subacromial decompression for subacromial shoulder pain (CSAW): a multicentre, pragmatic, parallel group, placebo-controlled, three-group, randomised surgical trial. Lancet (London, England), 391(10118), 329-338. https://doi.org/10.1016/S0140-6736(17)32457-1
2018Paavola et al. (2018). Subacromial decompression versus diagnostic arthroscopy for shoulder impingement: randomised, placebo surgery controlled clinical trial. BMJ (Clinical research ed.), 362, k2860. https://doi.org/10.1136/bmj.k2860
2021Paavola et al. (2021). Subacromial decompression versus diagnostic arthroscopy for shoulder impingement: a 5-year follow-up of a randomised, placebo surgery controlled clinical trial. British journal of sports medicine, 55(2), 99-107. https://doi.org/10.1136/bjsports-2020-102216
2020Lähdeoja et al. (2020). Subacromial decompression surgery for adults with shoulder pain: a systematic review with meta-analysis. British journal of sports medicine, 54(11), 665-673. https://doi.org/10.1136/bjsports-2018-100486
2022Klatte-Schulz et al. (2022). Subacromial Bursa: A Neglected Tissue Is Gaining More and More Attention in Clinical and Experimental Research. Cells, 11(4). https://doi.org/10.3390/cells11040663
2025Chepeha et al. (2025). A standardized criteria-based progressive shoulder exercise program is effective in managing rotator cuff-related shoulder pain: A prospective cohort study. PloS one, 20(7), e0328728. https://doi.org/10.1371/journal.pone.0328728

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