Subacromial decompression

For most people with subacromial pain, the mainstay of treatment is nonsurgical: activity modification, rehabilitation that restores motion and builds rotator-cuff and scapular strength and control, medication when appropriate, sometimes a corticosteroid injection, and time. Many shoulders settle with this approach, which is why it is generally worked through before an operation is considered.

Surgery enters the conversation selectively — usually when meaningful symptoms persist despite an appropriate trial of nonsurgical care and the examination and imaging point to a problem that an operation could reasonably help.

A subacromial decompression is usually done arthroscopically — through small portals, using a camera and thin instruments. The inflamed subacromial bursa is removed (a bursectomy), and, when appropriate, the undersurface of the acromion is smoothed to make a little more room in the subacromial space. This part of the procedure is sometimes called an acromioplasty.

A decompression is frequently performed as part of a larger operation rather than on its own — for example, at the same time as a rotator-cuff repair or a biceps procedure — because the surgeon may be addressing more than one structure. Whether it is done at all, and whether it is isolated or combined, is an individual decision.

It is worth understanding that decompression is not automatically beneficial for everyone with subacromial pain. High-quality studies comparing the operation with nonsurgical care, and with a look-inside procedure that did not include the decompression, have raised real questions about how much the decompression itself adds for many patients. That is one reason it is used selectively rather than routinely.

This does not mean the operation never helps — in carefully selected situations it can be a reasonable option — but it does mean the decision is made individually, after nonsurgical care, and with a realistic conversation about what surgery can and cannot be expected to do.

It matters whether the decompression is performed on its own or together with another procedure, because that affects which rehabilitation plan applies:

• An isolated subacromial decompression may follow the dedicated subacromial decompression rehabilitation protocol.
• When a decompression is performed together with a rotator-cuff repair, rehabilitation generally follows the applicable rotator-cuff repair protocol unless the surgeon specifies otherwise, because the repair usually sets the pace.
• Other concurrent procedures — such as a biceps tenodesis, a labral repair, or a shoulder stabilization — may impose different or more protective restrictions.

Because so much depends on exactly what was done, the operative note and the rehabilitation protocol your surgical team selects take precedence over any general description on this page. If you had more than one procedure, the plan is set by the combination of procedures, not by the decompression alone. Always follow the specific protocol you are given.

Rehabilitation after an isolated subacromial decompression is staged. In broad terms, it moves from an early period focused on comfort and gentle motion, to restoring full shoulder motion, to progressive strengthening, and then a gradual return toward normal activity. Because no tendon was repaired, an isolated decompression generally has fewer early restrictions than a rotator-cuff repair.

The specifics — how motion and strengthening are advanced, and when particular activities may resume — are set by the protocol your surgical team selects, and they change when other procedures are performed at the same time. Those detailed timelines are not reproduced here; your surgeon's protocol and operative note take precedence.

As with any surgery, a subacromial decompression carries risks and has limits. The possibilities below are for discussion with your surgeon and are not a complete list; which matter most depends on your situation:

• Infection
• Stiffness or loss of motion
• Persistent pain, or pain that is not fully relieved by the operation
• Bleeding or blood clots
• Nerve injury
• The possibility that another problem is the main source of symptoms
• The possible need for additional treatment or surgery

A subacromial decompression aims to reduce pain coming from an irritated subacromial space in selected situations where nonsurgical care has not been enough. Recovery is gradual and individual, and no operation guarantees complete relief of pain or a full return to previous activity. A realistic picture for your specific situation — including whether the decompression would be isolated or part of a larger operation — is best discussed with your surgeon.