Shoulder pain and impingement: the operation that placebo surgery matched
Subacromial decompression is one of the most commonly performed shoulder operations in the world, and it has been tested against placebo surgery in randomised trials. Patients who had their shoulder opened and nothing done improved as much as those who had the real procedure. That result should change what you are told before you consent.
Also called: shoulder impingement surgery, subacromial decompression, arthroscopic acromioplasty, rotator cuff related shoulder pain, frozen shoulder, shoulder arthroscopy
Timing check
Is this an emergency, or do you have time to think?
The single most useful thing a patient can know is which of these three situations they are in. Fear-based pressure usually happens in the third group, where there is actually time.
Do not wait, do not travel far, do not wait for a second opinion. These signs can mean a life-threatening problem.
- Shoulder or arm pain with chest pain, breathlessness, sweating, nausea or jaw pain, which can be a heart attack and needs emergency care immediately, particularly for left-sided pain
- A shoulder that is visibly deformed and cannot be moved at all after a fall or accident, which suggests dislocation or fracture
- Sudden inability to lift the arm at all after an injury, especially in someone over 40, which can mean a large acute tendon tear that is time-sensitive
- A hot, swollen, very painful shoulder with fever, which can mean joint infection and needs same-day assessment
- Numbness, severe weakness, coldness or a pale hand after shoulder injury, which suggests nerve or blood vessel involvement
This usually does need treatment soon, but there is normally still time to ask questions and understand the plan.
- Acute traumatic rotator cuff tear in a younger or active person, where repair is generally considered within weeks rather than months
- Repeated shoulder dislocations, which need assessment because each one can add damage
- Shoulder pain with unexplained weight loss, night sweats, a history of cancer, or a mass, which needs investigation before any treatment
- Progressive weakness rather than progressive pain, which is a different problem from impingement
- Pain that is severe and unremitting at night in someone who has not responded to first-line treatment
In this situation you almost always have time to think, ask questions and get another opinion before agreeing.
- Gradual shoulder pain on lifting the arm, worse overhead, without injury, which is the usual presentation and is not urgent
- Being advised arthroscopic decompression for impingement without having completed a supervised exercise programme
- Being told a bone spur seen on imaging must be shaved off, when the spur may not be the cause of your pain
- A frozen shoulder that is painful and stiff but improving, which usually resolves without surgery
- Degenerative rotator cuff changes reported on an MRI in someone over 50, which are common and often unrelated to symptoms
- Being offered surgery at the first consultation, before the diagnosis has been confirmed by examination
What the placebo-controlled trials found
Most operations are never compared against a fake version of themselves, because it seems unnecessary and it is difficult to justify. Subacromial decompression is one of the rare exceptions, and the results are among the most important findings in modern orthopaedics.
In the CSAW trial, patients with subacromial shoulder pain were randomly assigned to arthroscopic decompression, to a placebo arthroscopy in which the surgeon looked inside the shoulder but removed nothing, or to no treatment with review. Both surgical groups improved. The difference between real and placebo surgery was small and not clinically important. The Finnish FIMPACT trial reached the same conclusion, and its long-term follow-up published years later found the result had not changed with time.
The interpretation is not that patients imagine their pain, nor that they were not helped. They genuinely improved. It is that the improvement came from the passage of time, the rehabilitation afterwards, and the powerful effect of undergoing a procedure, rather than from removing bone or tissue. That distinction matters enormously to you, because the risks of anaesthesia and surgery are real whether or not the mechanism is.
- Ask your surgeon directly what they expect decompression to achieve for you beyond what the trials showed
- Ask whether your diagnosis is subacromial pain or impingement, because that is the population the trials studied
- Ask whether you have a full-thickness tendon tear, since that is a different situation not covered by these results
- Ask what supervised exercise you have actually completed, and for how long, before surgery is considered
- Ask what happens if you wait three more months and do the exercise properly
A surgeon who knows these trials and can explain why your case differs is giving you a genuine clinical reason. A surgeon unaware of them is recommending an operation without the evidence that tests it.
What a scan does and does not tell you
Shoulder imaging almost always finds something. Bone spurs, tendon thinning, partial tears and bursal changes are common in people over 40, including in shoulders that have never hurt. Studies of pain-free volunteers repeatedly find rotator cuff abnormalities in a substantial proportion, and the proportion rises steadily with age.
This creates a familiar sequence: the shoulder hurts, a scan is done, an abnormality is found, and the abnormality is presented as the cause and the target. Sometimes it is. Often it is an incidental age-related finding, and treating it does not relieve the pain, which is one reason placebo surgery performed as well as the real operation.
The useful diagnosis comes from the history and the physical examination: which movements hurt, what you can and cannot do, whether the arm is truly weak or only painful. A scan should confirm or refine that assessment rather than replace it.
- Ask whether your shoulder was examined before the scan was ordered, and what the examination showed
- Ask whether the reported finding is likely to be causing your symptoms, or is an age-related change
- Ask whether the tear, if any, is partial or full-thickness, because the treatment logic differs
- Ask whether the same finding would be expected in your other, painless shoulder
- Ask what the plan would be if no scan had been done at all
Where shoulder surgery does have a stronger case
The evidence against routine decompression does not mean all shoulder surgery is unnecessary, and it would be misleading to suggest otherwise. Several situations have a much stronger case, and delay in some of them causes harm.
An acute traumatic full-thickness rotator cuff tear in a younger or active person, especially with genuine weakness rather than pain-limited movement, is generally treated surgically and relatively promptly, because a retracted tendon becomes harder to repair over time. Recurrent dislocation, where the shoulder keeps coming out of joint, is another situation where stabilisation surgery has good support. Advanced shoulder arthritis with severe pain and lost function may warrant joint replacement. Joint infection is an emergency.
What separates these from the ordinary painful shoulder is a specific structural problem matched to a specific loss of function, in a patient for whom non-surgical care is either inappropriate or has genuinely failed. If your situation is one of these, the conversation should sound entirely different from the one about impingement, and it should be easy for your surgeon to explain which category you are in.
- Ask which specific diagnosis you have, in one sentence, and what examination finding supports it
- Ask whether your problem is one where delay causes harm, and why
- Ask what is likely to happen over the next year with and without surgery
- Ask what proportion of patients with your exact diagnosis this surgeon manages without operating
- If weakness is the main problem rather than pain, say so clearly, because that changes the assessment
True weakness means the arm cannot do the movement even when pain is controlled. Pain-limited movement is different, and the two are frequently confused in the consultation.
Doing exercise therapy properly, so the answer means something
The comparison in these trials was not against doing nothing. It was against supervised, progressive exercise. That is a specific treatment: a physiotherapist-led programme, sustained for around three months, with load progressively increased, and exercises adjusted as you improve. A photocopied sheet of movements handed over at a consultation is not the same thing, and its failure tells you nothing.
This matters practically. If you are told exercise failed, the honest question is whether it was ever adequately delivered. Many patients described as having failed conservative treatment have had a few weeks of unsupervised stretches and some painkillers.
Expect the programme to be uncomfortable at times. Loading a painful tendon under supervision is part of the treatment, not a sign it is going wrong. What matters is the trend over weeks rather than how any single session felt.
- Ask for a supervised programme with a named physiotherapist, and for a review date around three months
- Ask what progression to expect and how load will be increased
- Keep a simple record of what you can do each week, so improvement is visible rather than remembered
- Ask whether a steroid injection would help you tolerate the exercise, and what the limits on repeating it are
- If you were previously told exercise failed, ask exactly what was supervised, and for how long
Before you agree
Options that exist besides immediate surgery
Whether any of these suit you depends on your own examination and reports. The point of this list is not to tell you what to choose — it is so you know what to ask about.
Supervised progressive exercise therapy
A physiotherapist-led programme, typically over about three months, progressively loading the rotator cuff and correcting movement patterns. This is the comparator that matched surgery in randomised trials.
Usually considered when: First-line for subacromial or rotator-cuff-related shoulder pain without a full-thickness traumatic tear, and reasonable even alongside a plan for later surgery.
Limits: Requires attendance and sustained effort, works over months rather than weeks, and is less applicable to acute traumatic tears or recurrent dislocation.
Corticosteroid injection
An injection into the subacromial space to reduce pain, most useful as a way to make exercise possible rather than as a treatment on its own.
Usually considered when: Helpful where pain is limiting your ability to start or progress rehabilitation, and commonly used in frozen shoulder.
Limits: Benefit is often temporary, repeated injections have limits, and injections may adversely affect tendon tissue, so the number should be discussed explicitly.
Time, for frozen shoulder specifically
Adhesive capsulitis typically passes through painful, stiff and recovering stages and usually resolves over one to three years with pain relief, injection and exercise.
Usually considered when: The standard approach for most frozen shoulders, particularly in the painful early stage where surgery is generally avoided.
Limits: Recovery is slow and the middle stage is genuinely limiting. Persistent severe stiffness after adequate treatment may warrant a procedure.
Activity and load modification
Changing overhead work, gym technique, sleeping position and lifting patterns, and treating contributing factors such as diabetes and smoking that impair tendon healing.
Usually considered when: Useful for everyone, and often the difference between a programme that works and one that keeps being interrupted by flare-ups.
Limits: Not always possible for manual workers, and rarely sufficient by itself.
Step by step
Before, during and after this surgery
Before surgery
Preparation, tests, consent and costs.
Get a specific diagnosis, not a region
Shoulder pain is not a diagnosis. Ask whether this is subacromial pain, a partial or full-thickness cuff tear, frozen shoulder, arthritis, instability or referred neck pain, and which examination finding supports it.
Ask about the placebo-controlled evidence by name
If arthroscopic decompression is proposed, ask what the surgeon makes of the CSAW and FIMPACT trials and why your case differs. This is a fair question and a well-informed surgeon will answer it readily.
Complete real conservative treatment first
Ask for a supervised physiotherapy programme with a named therapist and a review at about three months. If you are told conservative treatment failed, establish precisely what was tried and for how long.
Separate pain from weakness
Say clearly whether you cannot lift the arm because it hurts, or because it will not go up even when pain is controlled. Genuine weakness changes the assessment and may indicate a significant tear.
Ask what specifically will be done, and to what
Get the planned procedure named: decompression, repair of a tear, capsular release, stabilisation, or replacement. Ask what happens if the surgeon finds something different once inside, and consent to that explicitly or not at all.
Understand the rehabilitation commitment before agreeing
Cuff repair in particular is followed by weeks in a sling and months of rehabilitation. Ask how long you cannot drive, work or lift, because a good operation with abandoned rehabilitation produces a poor result.
Get the cost in writing
Ask for the total including implants or anchors if a repair is planned, the anaesthetist, physiotherapy sessions, and follow-up. Ask what your insurance covers, and whether the procedure is listed under an approved package.
- What exactly is my diagnosis, and what examination finding supports it?
- What do you expect this operation to achieve that supervised exercise would not?
- How do the placebo-controlled trials of decompression apply to me?
- Do I have a full-thickness tear, and was it caused by an injury?
- Is my problem pain or true weakness?
- How many weeks in a sling, and how many months of physiotherapy afterwards?
- What happens if I do three more months of supervised exercise first?
- What is the total cost including implants, anaesthesia and physiotherapy?
On the day
What happens in theatre and what your family should expect.
Confirm the side and the planned procedure
The correct shoulder should be marked and the planned procedure restated to you before anaesthesia. Wrong-site surgery is rare precisely because this check is done every time, so expect it and take part in it.
Know what anaesthesia is planned
Shoulder surgery often uses a nerve block, sometimes with general anaesthesia. Ask what is planned, how long the arm will be numb afterwards, and what to do if numbness or weakness persists beyond the expected period.
Settle in advance what happens if findings differ
If the surgeon expects to find a small tear and finds a large one, the operation and the recovery change. Agree beforehand which additional procedures you consent to and which require waking you to discuss.
Ask for a photograph or record of the findings
Arthroscopy produces images. Asking for the findings and images in your discharge record gives you and any future doctor an objective account of what was actually there.
- Has the correct shoulder been marked, and can you confirm the planned procedure?
- What anaesthesia and nerve block are planned, and how long will the arm be numb?
- If you find something different inside, what will you do without asking me?
- Can the arthroscopic findings and images be included in my records?
After surgery, in hospital
Recovery, pain control and what good care looks like.
Know the infection and nerve warning signs
Increasing pain after the first few days, spreading redness, fever, or discharge needs same-day review. Numbness or weakness that persists well beyond the expected nerve block duration also needs prompt assessment.
Understand the sling instructions precisely
After a cuff repair the sling protects the repair, and moving too early can tear it. Ask exactly how many weeks, whether you may remove it to wash and dress, and which movements are forbidden in that period.
Start the prescribed movement on time
Stiffness is the commonest avoidable problem after shoulder surgery. Ask precisely which movements to start and when, and do not defer them because of ordinary post-operative discomfort.
Get the operative findings in writing
Ask for a discharge summary naming what was found, what was done, any implants or anchors used, and the rehabilitation protocol. You will need this if you seek care elsewhere.
Watch for clot symptoms even after arm surgery
Reduced activity after any operation raises clot risk. Calf pain or swelling, chest pain or breathlessness needs emergency assessment regardless of which part of the body was operated on.
- Which symptoms mean I should come back the same day?
- How many weeks in the sling, and which movements are forbidden?
- When does physiotherapy start, and who is arranging it?
- What was found and done, and can I have that in writing with the implant details?
- When can I drive, work and lift, in specific weeks?
At home
Healing, activity, follow-up and warning signs.
Recovery is measured in months
Even a straightforward shoulder procedure commonly takes three to six months to reach its result, and cuff repair often longer. Expecting improvement in weeks leads people to conclude too early that the surgery failed.
Rehabilitation is most of the treatment
The operation creates the opportunity; the strengthening produces the function. Attendance and progression through the programme influences the outcome at least as much as what was done in theatre.
Stiffness needs early attention
If your range of movement is not progressing at the expected rate, raise it early rather than waiting for the next scheduled appointment. Established stiffness is much harder to reverse than developing stiffness.
Judge the result against your own baseline
Record now what you can and cannot do: reach a shelf, fasten clothing, sleep on that side. Comparing against a written baseline is far more reliable than comparing against how you remember feeling.
Persistent pain deserves a rethink, not a repeat
If pain persists after full rehabilitation, ask whether the original diagnosis was right, including whether the pain is coming from the neck, before agreeing to a second procedure on the same shoulder.
- What range of movement should I have by six weeks, three months and six months?
- Is my progress on track, and if not what changes?
- At what point do we consider this the final result?
- If pain persists after full rehabilitation, what will you reconsider?
Call your surgeon or go to hospital if this happens after discharge
Complications are far less dangerous when they are caught early. Do not wait for your next appointment if you notice any of these. Keep your discharge summary and the hospital's emergency number with you.
- Shoulder or arm pain with chest pain, breathlessness, sweating or nausea, which needs emergency care
- A hot, swollen, very painful shoulder with fever, which can mean joint infection
- Increasing pain after the first few post-operative days rather than settling
- Spreading redness, discharge or a wound that opens
- Numbness or weakness persisting well beyond the expected nerve block duration
- Sudden loss of the ability to lift the arm after surgery, which can mean a repair has failed
- Calf pain or swelling, chest pain or breathlessness at any time after surgery
- Range of movement that is going backwards rather than forwards
What patients report
Patterns patients and families describe
These are recurring themes summarised from public patient discussions and the experiences shared with us. They are reported experiences, not clinical evidence, and they are not accusations against any hospital or doctor. We publish them because knowing a pattern exists is what lets you ask the right question at the right moment. No provider is named here, ever.
Surgery advised after a scan rather than after treatment
A frequent account is that a scan found a spur or a partial tear and surgery was recommended at that visit, with no supervised physiotherapy attempted. Because such findings are common in painless shoulders too, the scan alone is weak grounds for operating.
What helps: Ask whether the reported finding explains your specific symptoms, and ask for a supervised three-month programme with a review date before agreeing to surgery.
Conservative treatment counted as failed when it was never delivered
Patients often report being told physiotherapy had failed when what actually happened was a printed exercise sheet, painkillers, and no supervision or progression.
What helps: Ask for the record of what was supervised and for how long. If it was not a progressive programme with a named therapist, the conclusion that it failed does not hold.
Stiffness after surgery from unclear instructions
A recurring complaint is confusion about how long to keep the arm still, leading either to too much rest and a stiff shoulder, or to too much movement and a failed repair.
What helps: Get the sling duration, permitted and forbidden movements, and physiotherapy start date in writing before discharge, and confirm who is booking the physiotherapy.
Pain that turned out to be coming from the neck
Some patients describe shoulder surgery that changed nothing, followed later by a diagnosis of cervical nerve root irritation referring pain into the shoulder and arm.
What helps: Ask specifically whether your neck has been examined as a source, particularly if pain travels below the elbow, is associated with neck movement, or comes with tingling in the fingers.
Unbudgeted implant and physiotherapy costs
Where a repair is performed, accounts commonly describe anchors, implants or extended physiotherapy appearing in the final bill above the quoted package.
What helps: Ask for a written estimate that names implants and the expected number of physiotherapy sessions, and ask what the cost becomes if a larger repair is needed than planned.
Money clarity
Billing questions specific to this surgery
We do not publish price estimates, because real costs vary by city, hospital category, implant choice and your insurance terms. What we can give you is the list of questions that prevent a surprise bill.
- Ask for a written estimate that separates surgeon, anaesthetist, facility, implants or anchors, and physiotherapy
- Ask what the cost becomes if the surgeon finds a larger tear and performs a bigger repair than planned
- Ask how many physiotherapy sessions are included and what each additional session costs
- Ask whether your insurance covers this procedure and whether pre-authorisation has been obtained in writing
- Ask whether a nerve block or overnight stay changes the quoted amount
- Ask for the itemised bill at discharge and check implant charges against the written estimate, since implant pricing is regulated and you are entitled to the details
Sources
Figures on this page are drawn from the following published sources, and each one names its publisher and country so you can judge how closely it applies to you. Outcomes, prices and consent law differ between health systems, so where a figure comes from one country we say which.
- Arthroscopic subacromial decompression for subacromial shoulder pain (CSAW): a multicentre, pragmatic, parallel group, placebo-controlled, three-group, randomised surgical trial The Lancet 2018 View source
- Subacromial decompression versus diagnostic arthroscopy for shoulder impingement: long-term follow-up of a randomised placebo-controlled trial (FIMPACT) The BMJ 2021 View source
- Subacromial decompression surgery for adults with shoulder pain: a systematic review with meta-analysis Cochrane Database of Systematic Reviews 2019 View source
- Prevalence of rotator cuff abnormalities in asymptomatic shoulders PubMed Central 2019 View source
- Adhesive capsulitis of the shoulder: natural history and management StatPearls, National Library of Medicine 2024 View source
Notes from patients and verified doctors
Every note is read by a moderator before it appears. Please do not name any hospital, doctor or staff member, do not post prescriptions or dosages, and do not upload bills or reports here. Write what you learned, what you wish you had asked, or what confused you — that is what helps the next patient.
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