Shoulder impingement is best treated with a progressive strengthening program for the rotator cuff and shoulder blade muscles, usually over about 12 weeks. Most cases are rotator cuff tendinopathy, where the tendon is overloaded, rather than a true pinch.

“You have shoulder impingement.” It is one of the most common shoulder diagnoses handed out, and one of the most misunderstood. The word paints a clear picture: something in the shoulder is being pinched, and if we can just stop the pinching, the pain will go. The picture is tidy. It is also mostly wrong, and it has led a lot of people down a path of injections and surgery that does not hold up to scrutiny.

What “impingement” was supposed to mean

The idea dates to the 1970s. The theory was that the rotator cuff tendons and the bursa above them get squeezed against the bony arch on top of the shoulder, called the acromion, every time the arm is raised. Over time that mechanical rubbing was thought to irritate the tendons, cause bursitis and eventually wear through the tendon. Surgeons developed an operation, subacromial decompression, to shave the underside of the acromion and create more space.

For decades this was the standard explanation, and thousands of decompression operations were done every year on that basis. The trouble is that when researchers tested the theory properly, it did not hold up.

Why the thinking has changed

Several lines of evidence have undermined the mechanical pinching model.

Acromion shape does not predict pain. People with the “hooked” acromion that was supposed to cause impingement are no more likely to have shoulder pain than people without it, and plenty of people with flat acromions have painful tendons.

The tendons are not being rubbed from above. Detailed studies show that rotator cuff tendon changes typically begin on the underside of the tendon, the side facing the joint, not the side facing the bone.

Most importantly, the surgery does not work better than a placebo. Two large trials, one in the UK and one in Finland, compared subacromial decompression with a sham operation in which the shoulder was looked at with a camera but nothing was removed. Both groups improved by the same amount. A third group who had no surgery and just did exercise did about as well.

If removing the supposed cause of the pinching makes no difference, the pinching was not the cause. Guidelines in the UK and elsewhere now recommend against the operation for this diagnosis.

What’s is shoulder impingement?

In the large majority of shoulders labelled with impingement, the problem is rotator cuff tendinopathy: the tendons on top of the shoulder have become painful and sensitised because the load going through them has outstripped their capacity. Sometimes the bursa, the fluid filled cushion above the tendons, is irritated alongside them. This is why the term “impingement” is gradually being replaced by “rotator cuff related shoulder pain” or “subacromial pain”.

The shift matters because it changes the treatment. If the problem is a tendon that is not coping with its load, the answer is to build the tendon’s capacity, not to make more room for it. We have a separate article on the rotator cuff that goes into the tendons themselves. This one focuses on the impingement label and what to do if you have been given it.

What cause shoulder impingement?

Tendons become painful when the demands on them change faster than they can adapt. Common triggers include:

A sudden increase in overhead work: a new gym program with lots of pressing, a painting job, a burst of throwing or swimming, or pre-season training.
Repetitive overhead or reaching work in a job, such as trades, hairdressing or warehouse work.
A period of not using the shoulder, followed by a return to normal activity that the deconditioned tendon could not tolerate.
Weakness in the rotator cuff and the muscles around the shoulder blade, so the shoulder is less well controlled under load.
Age. Tendons in their forties and fifties tolerate spikes in load less well than tendons in their twenties.
General factors: poor sleep, high stress, smoking and diabetes all reduce tendon health and increase pain sensitivity.

Posture gets blamed a great deal, particularly rounded shoulders. The evidence linking posture to shoulder pain is weak. Changing how the shoulder blade moves can help some people feel better in the short term, but it does so by changing the load on a sensitive tendon, not by unpinching anything.

What does shoulder impingement feel like?

Pain on the front and outside of the shoulder, often spreading down the upper arm towards the elbow.
Pain when lifting the arm out to the side or in front, worst through the middle of the range, sometimes easing again as the arm reaches the top. This is called a painful arc.
Pain reaching behind the back, into the back seat or into a high cupboard.
Pain lying on the shoulder at night and with pressing or overhead lifting in the gym.
Weakness or discomfort with the arm held out to the side.
Usually no significant restriction when someone else moves the arm, which helps distinguish it from frozen shoulder.

What else could my shoulder pain be?

The impingement label is applied loosely, and several other problems can produce shoulder pain with overhead movement:

A rotator cuff tear, particularly after a fall or heavy lift, with marked weakness.
Frozen shoulder, where the joint is stiff in every direction, including passively.
Calcific tendinitis, where a deposit of calcium in the tendon causes sudden, severe pain that can be dramatic.
Acromioclavicular joint problems, felt on top of the shoulder rather than the outside.
Shoulder instability in younger people, particularly athletes in throwing and contact sports.
Referred pain from the neck, which often comes with pain down the arm and pins and needles.
Shoulder osteoarthritis in older adults.

A good examination separates these. Scans are rarely needed early. Ultrasound in particular tends to report “bursal thickening” and “tendinosis”, which are common in pain free shoulders and rarely change the plan.

What helps shoulder impingement?

Progressive strengthening

Exercise is the treatment with the strongest evidence. In the surgical trials described above, the exercise group did as well as the surgical groups, and numerous other studies show that a structured strengthening program reduces pain and restores function for most people with this diagnosis.

A typical program starts with rotator cuff rotation exercises using a resistance band, exercises for the muscles that control the shoulder blade, and low load lifting within a comfortable range. It then progresses to heavier and more functional loading: pressing, pulling, carrying and eventually the overhead and sport specific movements that matter to you. The load increases as the tendon tolerates it. Some discomfort during exercise is fine as long as it settles within 24 hours.

Expect this to take around 12 weeks of consistent work, with noticeable improvement often within four to six.

Short term load modification

Early on, it helps to reduce the specific things that flare the shoulder, such as overhead pressing, sleeping on that side or long stretches of overhead work, while keeping the rest of your activity going. This is temporary. The goal is to bring those activities back, not remove them permanently.

Hands-on treatment

Soft tissue work, joint mobilisation and dry needling can ease pain and make it more comfortable to exercise. Their effect is short term and they work best alongside a strengthening program.

Injection, in the right circumstances

A corticosteroid injection into the bursa can provide good short term pain relief, typically for a few weeks to a couple of months. It is useful when the shoulder is so irritable that exercise is impossible or night pain is destroying sleep. Beyond about three months, outcomes are no better than exercise alone, and repeated injections can be harmful to tendon tissue. It is a way to enable rehab, not a substitute for it.

What doesn’t help shoulder Impingement?

Subacromial decompression surgery for this diagnosis. As above, it performs no better than placebo surgery.
Rest. Deconditions the shoulder further.
Stretching as the main treatment. The problem is rarely tightness.
Repeated injections without a rehab program.
Ultrasound therapy, laser, shockwave and similar machines for non-calcific tendon pain.
Posture braces and shoulder supports.
Scans to “see what is going on” before a proper trial of treatment.

How long does shoulder impingement take to recover?

Most people improve substantially within 6 to 12 weeks. Shoulders that have been painful for more than a year, or in people with diabetes or heavy overhead jobs, often take longer and need more careful progression. Some fluctuation along the way is normal and does not mean the program has failed.

If there has been no meaningful change after 12 weeks of a genuine, progressive program, that is the point to reassess the diagnosis, consider imaging and think about other options.

When to get shoulder impingement checked promptly?

Get an assessment soon if you have shoulder pain with any of the following:

A fall, heavy lift or sudden wrench followed by immediate weakness or inability to lift the arm.
Severe, sudden pain with no obvious trigger, which can be calcific tendinitis.
Progressive stiffness in all directions.
Pain with pins and needles, numbness or weakness in the hand.
Fever, redness or a hot swollen joint.
Pain that has not changed at all after a proper trial of treatment.

What treatment at VIBE looks like

We start with a detailed history about your work, training and what triggered the pain, then examine the shoulder, shoulder blade and neck, testing strength in each direction and identifying the movements that reproduce your pain. We will tell you plainly whether “impingement” is the right label for you, what it means in current terms and what else, if anything, we need to rule out.

You will leave with a starting program of two or three exercises matched to how irritable the shoulder is, a clear plan for what to modify at work or in the gym over the next couple of weeks, and a realistic timeline. Over the following sessions the loading is progressed, hands-on treatment is used where it helps and we measure strength and range so you can see change. If you are not tracking as expected, we will reassess and organise imaging or a medical opinion rather than keep going with the same plan.

Wrap-up

Shoulder impingement is an old label built on a theory that has not survived testing. In most cases the real problem is a rotator cuff tendon that is not coping with the load being asked of it, and the treatment with the best evidence is a progressive strengthening program over about 12 weeks, supported by short term load management and, where needed, an injection to make exercise possible. Surgery to “create space” performs no better than a sham operation and is no longer recommended.

If you have been told you have impingement, or your shoulder hurts every time you reach overhead, book an assessment at VIBE Health & Performance in Homebush or Seven Hills. We will work out what is actually going on and get you loading the shoulder the right way.

How do you treat Shoulder Impingement?