Subacromial decompression: keyhole shoulder surgery explained

Shoulder pain that is worse when lifting the arm out to the side or overhead is often called impingement or subacromial pain. The theory is that the tendon is squeezed beneath the bony roof of the shoulder. In practice the problem is often tendon overload or irritation, and research has questioned how much of the benefit comes from removing bone.

That is why the Gateshead leaflet frames the operation as a possibility only after painkillers, activity changes, physiotherapy to strengthen muscles and steroid injections have not worked after appropriate rehabilitation. If you have not had a structured physiotherapy programme, it is reasonable to ask for one first.

Pre-assessment covers fitness for anaesthetic, medicines and fasting instructions. Because the sling is used only briefly in many units, preparation is mainly practical: arrange someone to drive you home and help for a few days, wear a loose, front-opening top, and decide how you will sleep comfortably.

Do the exercises you are given before surgery if any, and keep your neck and elbow moving so they do not stiffen.

Small cuts are made around the shoulder. A camera is inserted and the surgeon releases the ligament at the front of the acromion and shaves a small amount of bone from its underside, widening the space. Other work, such as treating the acromioclavicular joint or repairing a tendon, may be added.

The Gateshead leaflet says the procedure is usually done under regional anaesthetic (a nerve block), with or without general anaesthetic. Most people go home the same day.

Gateshead lists significant pain in the first six weeks, stiffness, wound infection (below 1%), bleeding (below 1%), nerve injury (below 1%), scarring, symptoms that persist, and clots in the leg or lung. The Hull leaflet stresses that physiotherapy afterwards is essential for a good result.

The main practical risk is that surgery does not give the improvement hoped for, which is why alternatives are tried first.

Hull describes using the sling for only two to three days, wound healing in ten to fourteen days and avoiding overhead activity for around three months. Gateshead gives office work at two to four weeks, manual jobs at about three months and freestyle swimming at about twelve weeks.

Gentle exercises start on day one and outpatient physiotherapy begins about a week after the operation, in the Gateshead guidance. Full benefit may take six to nine months.

• Fever, wound discharge, or a wound that becomes red, sore or painful: contact your surgeon's team or NHS 111.

• Calf swelling or pain, or breathlessness: seek urgent help.

• Feeling generally unwell in the days after surgery.

• What did my scan show, and is my tendon intact?

• Have I had enough physiotherapy to say it has failed?

• What improvement is realistic for me?

• Will anything else be done during the operation?

Some NHS areas restrict this operation unless a documented period of rehabilitation has failed, whereas private providers may be quicker to list it. That should not stand in for a candid conversation about expected benefit. Ask in either setting what the surgeon's own results are and what physiotherapy is included.