Cookies on the Bupa website

We use cookies to help us understand ease of use and relevance of content. This ensures that we can give you the best experience on our website. If you continue, we'll assume that you are happy to receive cookies for this purpose. Find out more about cookies



Subacromial decompression

Subacromial decompression (acromioplasty) is an operation on your shoulder. It’s used to treat a condition called shoulder impingement. This is when the bones and tendons in your shoulder rub against each other when you raise your arm, causing pain.

The word ‘subacromial’ means ‘under the acromion’. The acromion is part of your shoulder blade (scapula), and it helps to form your shoulder joint.

If you’re having a subacromial decompression procedure it will probably be done through keyhole surgery (arthroscopy) under a general anaesthetic. Most people get to go home on the same day. Find out more about having the procedure in our section ‘what happens during subacromial decompression’ below.

What is shoulder impingement

If you have shoulder impingement, a bone at the top of your shoulder rubs against the tendons in your shoulder when you raise your arm. This causes pain when you try to raise your arm, and restricts your movement.

There’s normally a space between the top of your arm bone and the bone at the top of your shoulder blade, called the subacromial area. A small, fluid-filled sac (bursa) in this space allows the tendons between your upper arm and shoulder to glide freely when you move your arm. Your surgeon may mention the words ‘rotator cuff’. This is the name given to the muscles and tendons surrounding the top of your upper arm bone, attaching it to your shoulder blade.

In subacromial impingement, the amount of space between your shoulder blade and rotator cuff tendons is reduced. This may be due to irritation and swelling of the bursa. It can also be caused by the development of growths (bony spurs) on the top of your shoulder blade. These occur because of ‘wear and tear’ arthritis (osteoarthritis).

Subacromial decompression can open up this space by removing any swollen or inflamed bursa, and any bony spurs.

Preparing for subacromial decompression

Your operation will be carried out by an orthopaedic surgeon (a doctor who specialises in bone surgery). They’ll explain how to prepare for your procedure. For example, if you smoke, you’ll be asked to stop. Smoking increases your risk of getting a chest or wound infection, which can slow your recovery.

Before you go into hospital you’ll need to make some preparations for after your surgery. The operation is usually done as a day case, which means you won’t have to stay overnight in hospital. You’ll need to arrange for a friend or family member to collect you from hospital after your surgery and take you home. And make plans for someone to be with you for at least the first day after you come home.

You’ll probably be having a general anaesthetic during your operation, so you’ll be asked to follow fasting instructions. This means not eating or drinking, typically for about six hours beforehand. Follow your anaesthetist or surgeon’s advice carefully.

Your surgeon will discuss with you what will happen before, during and after your procedure, and any pain you might have. This is your opportunity to ask questions so that you understand what will be happening. You don’t have to go ahead with the procedure if you decide you don’t want it. Once you understand the procedure and if you agree to have it, you’ll be asked to sign a consent form.

What are the alternatives to subacromial decompression?

For some people, subacromial decompression isn’t necessary. Shoulder pain has various causes and the symptoms can often be managed with other options such as:

Your surgeon will usually only recommend you have subacromial decompression if other treatments haven’t worked for you.

What happens during subacromial decompression?

Subacromial decompression can take around an hour, depending on how complicated your operation is. The operation is usually done as a keyhole procedure using a narrow, flexible, tube-like telescopic camera called an arthroscope.

Subacromial decompression is usually done under general anaesthesia, which means that you’ll be asleep during the procedure. You may also be given a local (regional) anaesthetic into the nerves around your shoulder. This helps to reduce any pain you may feel after your operation. Once the anaesthetic has taken effect, your surgeon will make small cuts in the skin around your shoulder. Usually there will be three small cuts, but sometimes more are needed.

Your surgeon will look into the area called the subacromial space within your shoulder. This will be either directly through the arthroscope, or at pictures sent from the arthroscope to a monitor. They’ll insert specially designed surgical instruments through the small cuts and reshape this part of your shoulder blade. Your surgeon may also decide to repair any damaged tendons at the same time. This may mean your surgeon has to change from keyhole surgery to an open operation and will make a larger cut in your shoulder. See our FAQ on arthroscopy or open surgery below for more information.

At the end of the operation, your surgeon will remove the surgical instruments and close the cuts, usually with stitches.

What to expect afterwards

You’ll need to rest until the effects of the anaesthetic have passed. Let your nurse know if you’re in pain. You’ll be offered pain relief to help with any discomfort as the anaesthetic wears off.

You’ll usually be able to go home when you feel ready. Someone else should drive you home. Try to have a friend or relative stay with you for the first 24 hours.

Having general anaesthesia can temporarily affect your co-ordination and reasoning skills. So don’t drive, drink alcohol, operate machinery or sign legal documents for 24 hours afterwards. If you’re in any doubt about driving, contact your motor insurer so that you’re aware of their recommendations, and always follow your surgeon’s advice.

Before you leave hospital your nurse will give you advice about caring for your wounds, and what to do about any stitches you have. You may need to keep your arm in a sling for a few days after your operation.

Recovering from subacromial decompression

You’ll need to be patient, as it usually takes between two and four months to make a full recovery from subacromial decompression, sometimes longer. But the operation is successful in between eight and nine out of 10 people.

If you need pain relief, you can take over-the-counter painkillers such as paracetamol or ibuprofen. Always read the patient information leaflet that comes with the medicine and if you have any questions, ask your pharmacist for advice.

You may see a physiotherapist (a health professional who specialises in maintaining and improving movement and mobility) after your operation. It’s really important that you do any exercises that your physiotherapist or surgeon recommends. These may help you to recover more quickly. Your surgeon or physiotherapist will tell you when to start these exercises, and how many to do.

You may be able to return to work within a few days of your procedure. However, this will depend on how complicated your operation was and the type of job you have. Ask your surgeon or physiotherapist for advice about returning to work and other activities.

Side-effects of subacromial decompression

Side-effects are the unwanted but mostly temporary effects you may get after having the procedure.

You may have some pain and stiffness around your shoulder after surgery. This may make moving around uncomfortable at first.

If you develop any of the following symptoms, contact your hospital immediately as it may indicate you have an infection or other complication.

  • Your wound becomes hot, red or swollen.
  • Your wound bleeds or becomes more painful.
  • You have a high temperature.

Complications of subacromial decompression

Complications are when problems occur during or after the procedure. It’s not possible to say for sure how likely each person is to get these – ask your surgeon how these risks might apply to you.

There are several possible complications of any operation. These include an unexpected reaction to the anaesthetic, a blood clot in the veins of your leg (deep vein thrombosis, DVT), excessive bleeding or infection.

A possible complication of subacromial decompression is accidental damage to your shoulder blade or another part of your shoulder joint, including nerves or blood vessels.

Subacromial decompression surgery is successful in between eight and nine out of 10 people. This means that in one or two out of 10 people the surgery is unsuccessful, and they will continue to have shoulder symptoms.

FAQ: What exercises can I do to help my recovery?

Your surgeon or physiotherapist will give you a range of exercises to do after your surgery. It’s important to do these exercises as they will help you to recover more quickly. These may include exercises to:

  • stretch the muscles around your shoulder
  • improve the range of motion of your shoulder
  • improve the strength of your muscles around your shoulder

Your physiotherapist will tell you when you can start these exercises, and how many you need to do. You’ll have exercises to do at home and you may also be offered a course of hospital-based physiotherapy sessions.

It may take several months after your operation to completely recover. However, you’ll probably be able to get back to your usual activities after about two to four months.

FAQ: Should I have arthroscopic surgery or open surgery?

Whether you have open or arthroscopic surgery will depend on the problems you’re having with your shoulder and your medical history. Your surgeon will talk to you about what’s best in your situation.

It’s common for shoulder surgery to be done using an arthroscopic technique. This means your surgeon will make small cuts in your shoulder to pass specially adapted surgical equipment through to repair your shoulder. Having just small cuts may reduce the pain you have after surgery. It may also mean you recover more quickly than with open surgery – getting back to your usual activities sooner.

Open surgery means your surgeon makes a larger cut in your shoulder. This allows your surgeon to see your shoulder blade, rotator cuff muscles and tendons directly. Sometimes your surgeon may have to convert from using arthroscopic surgery to open surgery if your rotator cuff tendons need to be repaired as well.

Doctors aren’t sure yet, but it doesn’t seem that you’re any more likely to get complications after open surgery than arthroscopic surgery.

Ask your surgeon to explain which is the best option for you in your circumstances.


  • Physiotherapy

    At our Health Centres, we offer self-pay health services for a wide range of conditions, including physiotherapy.

  • Other helpful websites Other helpful websites

    Further information


    • Shoulder impingement syndrome treatment and management. Medscape., updated 23 June 2015
    • Shoulder pain. NICE Clinical Knowledge Summaries., last revised April 2015
    • Map of Medicine. Shoulder pain. International View. London: Map of Medicine; 2015 (Issue 5)
    • Coghlan J, Buchbinder R, Green S, et al. Surgery for rotator cuff disease. Cochrane Database of Systematic Reviews 2008, Issue 1. doi: 10.1002/14651858.CD005619.pub2
    • Shoulder impingement/rotator cuff tendinitis. American Academy of Orthopaedic Surgeons., last reviewed February 2011
    • Shoulder arthroscopy. American Academy of Orthopaedic Surgeons., last reviewed April 2011
    • Shoulder surgery. American Academy of Orthopaedic Surgeons., published August 2009
    • Kulkarni R, Gibson J, Brownson P et al. Subacromial shoulder pain. BESS/BOA Patient Care Pathways. Shoulder & Elbow 2015; 7(2):135–43. doi: 10.1177/1758573215576456
    • Managing rotator cuff disorders. Arthritis Research UK., published 2010
    • What causes shoulder pain? Arthritis Research UK. www.arthritisresearchuk, accessed 9 August 2016
  • Has our information helped you? Tell us what you think about this page

    We’d love to know what you think about what you’ve just been reading and looking at – we’ll use it to improve our information. If you’d like to give us some feedback, our short form below will take just a few minutes to complete. And if there's a question you want to ask that hasn't been answered here, please submit it to us. Although we can't respond to specific questions directly, we’ll aim to include the answer to it when we next review this topic.

    Let us know what you think using our short feedback form
  • Related information Related information

  • Author information Author information

    Reviewed by Dr Kristina Routh, Freelance Health Editor, Bupa Health Information Team, August 2016
    Peer reviewed by Mr Roger M Tillman FRCS Orth, Consultant, Royal Orthopaedic Hospital Birmingham
    Next review due September 2019

About our health information

At Bupa we produce a wealth of free health information for you and your family. We believe that trustworthy information is essential in helping you make better decisions about your health and care. Here are just a few of the ways in which our core editorial principles have been recognised.

  • Information Standard

    We are certified by the Information Standard. This quality mark identifies reliable, trustworthy producers and sources of health information.

    Information standard logo
  • HONcode

    This site complies with the HONcode standard for trustworthy health information:
    verify here.

    This website is certified by Health On the Net Foundation. Click to verify.

What our readers say about us

But don't just take our word for it; here's some feedback from our readers.

Simple and easy to use website - not alarming, just helpful.

It’s informative but not too detailed. I like that it’s factual and realistic about the conditions and the procedures involved. It’s also easy to navigate to areas that you specifically want without having to read all the information.

Good information, easy to find, trustworthy.

Meet the team

Nick Ridgman

Nick Ridgman
Head of Health Content

  • Dylan Merkett – Lead Editor
  • Graham Pembrey - Lead Editor
  • Laura Blanks – Specialist Editor, Quality
  • Michelle Harrison – Specialist Editor, Insights
  • Natalie Heaton – Specialist Editor, User Experience
  • Fay Jeffery – Web Editor
  • Marcella McEvoy – Specialist Editor, Content Portfolio
  • Alice Rossiter – Specialist Editor (on Maternity Leave)

Our core principles

All our health content is produced in line with our core editorial principles – readable, reliable, relevant – which are represented by our diagram.

An image showing or editorial principals

                  Click to open full-size image

The ‘3Rs’ encompass everything we believe good health information should be. From tweets to in-depth reports, videos to quizzes, every piece of content we produce has these as its foundation.


In a nutshell, our information is jargon-free, concise and accessible. We know our audience and we meet their health information needs, helping them to take the next step in their health and wellbeing journey.


We use the best quality and most up-to-date evidence to produce our information. Our process is transparent and validated by experts – both our users and medical specialists.


We know that our users want the right information at the right time, in the way that suits them. So we review our content at least every three years to keep it fresh. And we’re embracing new technology and social media so they can get it whenever and wherever they choose.

Our accreditation

Here are just a few of the ways in which the quality of our information has been recognised.

  • The Information Standard certification scheme

    You will see the Information Standard quality mark on our content. This is a certification programme, supported by NHS England, that was developed to ensure that public-facing health and care information is created to a set of best practice principles.

    It uses only recognised evidence sources and presents the information in a clear and balanced way. The Information Standard quality mark is a quick and easy way for you to identify reliable and trustworthy producers and sources of information.

    Certified by the Information Standard as a quality provider of health and social care information. Bupa shall hold responsibility for the accuracy of the information they publish and neither the Scheme Operator nor the Scheme Owner shall have any responsibility whatsoever for costs, losses or direct or indirect damages or costs arising from inaccuracy of information or omissions in information published on the website on behalf of Bupa.

  • British Medical Association (BMA) patient information awards

    We have received a number of BMA awards for different assets over the years. Most recently, in 2013, we received a 'commended' award for our online shared decision making hub.

Contact us

If you have any feedback on our health information, we would love to hear from you. Please contact us via email: Or you can write to us:

Health Content Team
Battle Bridge House
300 Grays Inn Road

Find out more Close

Legal disclaimer

This information was published by Bupa's Health Content Team and is based on reputable sources of medical evidence. It has been reviewed by appropriate medical or clinical professionals. Photos are only for illustrative purposes and do not reflect every presentation of a condition.

The information contained on this page and in any third party websites referred to on this page is not intended nor implied to be a substitute for professional medical advice nor is it intended to be for medical diagnosis or treatment. Third party websites are not owned or controlled by Bupa and any individual may be able to access and post messages on them. Bupa is not responsible for the content or availability of these third party websites. We do not accept advertising on this page.

For more details on how we produce our content and its sources, visit the 'About our health information' section.

ˆ We may record or monitor our calls.