How Serious Is a Full Thickness Tear of the Supraspinatus Tendon?

A full-thickness tear sounds alarming, and it is a genuine structural injury: a hole through the tendon that does not knit itself back together. Yet for many people it turns out to be less serious than the words suggest, because how much it hurts or limits you has little to do with how big it looks on a scan.¹ The seriousness lies less in the diagnosis itself than in what the tear does over the years, and whether your own shoulder is likely to cope with it or slowly lose ground.

What a Full-Thickness Supraspinatus Tear Actually Means

The supraspinatus is one of four rotator cuff tendons. Its main job is to keep the ball of the upper arm pressed into the shallow socket while other muscles lift the arm.² A partial-thickness tear goes only part of the way into the tendon. A full-thickness tear goes all the way through it.³ “Full-thickness” tells you the tear’s depth, not how long or wide it is.⁴ The word covers anything from a small slit to a gap several centimetres wide, which is why two people told they have the same tear can have very different outlooks. It is also different from a tendon that is simply worn thin or inflamed, which has no hole through it.

Your report may use other words too. Size is usually given in centimetres, measured front to back or by how far the tendon has pulled back. “Retracted” means the torn end has pulled away toward the muscle. “Atrophy” or “fatty” wording refers to the muscle, not the tendon, and it matters for the outlook. It is also worth asking which tendon or tendons are involved, since one torn tendon is a better situation than several.

When the supraspinatus is torn through and cannot be repaired, the ball of the arm can ride up two to three times further than normal in tests on shoulders.⁵ The reason is that the torn tendon presses the ball into the socket less firmly, leaving it about 12 to 15% less held in place.⁶ Pressure under the bony roof of the shoulder can then rise to two to three times normal, which helps explain pinching pain when you lift the arm.⁷

The gap does not close on its own. The torn end sits where blood supply is limited, and muscle tension keeps pulling the edges apart. Rest calms the pain but does not reattach the tendon to bone, so “getting better” without surgery means symptoms improving, not the hole closing.

Why Pain Does Not Tell You How Bad the Tear Is

Some people with massive tears have few complaints, while some with small tears are badly limited.⁸ In people seeking care for full-thickness tears, no measure of tear severity was linked to how much pain they reported.⁹ Larger tears were linked, weakly, to worse shoulder function.¹⁰

Pain comes from several sources: the inflamed bursa above the tendon, irritated tissue under the bony roof of the shoulder, and the nervous system’s own sensitivity. Other muscles may be covering well for a large tear, while a small tear in a stiff or irritated shoulder can hurt a great deal. A scan shows how the tendon looks but cannot predict how your shoulder feels. Finding a tear also does not prove it is the source of your pain: in general population studies using ultrasound, about 11 to 17% of shoulders with no pain at all had a full-thickness tear.¹¹

Deciding on surgery from the scan alone is a common mistake. Your symptoms, strength and daily needs guide the decision alongside the image, and a painful shoulder with a small tear may respond well to therapy.

What does go along with more pain is often outside the shoulder. Having more other health conditions was one of the few things linked to more pain when people first came in.¹² Mental wellbeing was the factor most strongly linked to how much pain and disability people reported, more than any tear measurement.¹³ Across studies, about 1 in 5 people with cuff tears had depression and around 7 in 10 had disturbed sleep.¹⁴

Night pain feeds this loop. Lying on the shoulder often hurts, so sleep is broken, and poor sleep lowers pain tolerance the next day. Sleeping propped up, or with a pillow under the arm, can ease night pain.

Does a Full-Thickness Tear Get Worse Over Time

In people treated without surgery, about three quarters of full-thickness tears had grown larger after roughly three years.¹⁵ In a group of people around 70 years old, about half showed the tear widening on a repeat MRI.¹⁶ Tears that also involve the tendon at the front of the shoulder were more likely to grow.¹⁷

The tear is a gap under constant muscle pull, so its edges can fray further with ordinary use. Growth is common but not certain, and a minority of tears stay the same size for years.

Growth does not always mean more pain. A tear can enlarge without symptoms changing much, which is why some doctors repeat a scan rather than relying on how you feel. Growing weakness, such as trouble lifting the arm, is a more useful warning sign than pain alone, though only a scan confirms growth.

The muscle behind the tear changes too. Once a tear is present, fat starts to build up inside the attached muscle early on.¹⁸ It shows on MRI as pale streaks within the muscle. Moderate fat build-up tends to appear around 3 years after symptoms begin and severe build-up around 5 years.¹⁹ Muscle shrinkage creeps on more gradually over the years.²⁰ Fat-laden muscle is weaker and does not recover its strength well, even after the tendon is reattached. That is the main reason doctors care about timing: the tendon can sometimes still be repaired while the muscle has lost its quality.

As the tear grows, the shoulder compensates. Other muscles, especially the deltoid on the outside of the shoulder, take on extra work, and the shoulder blade moves differently to help lift the arm. This keeps people functioning but adds strain elsewhere in the joint.

For some people, the long-term end point is joint damage. The joint can eventually develop arthritis known as cuff tear arthropathy.²¹ The ball of the arm rides upward and rubs against bone, wearing down cartilage.²²

What Makes One Tear More Serious Than Another

Tears are grouped by size:

Several features predict worse progress. Medium tears were far more likely to grow than small ones in people managed without surgery.²⁷ Fat build-up and shrinkage in the cuff muscles made widening of the tear more likely.²⁸ Diabetes was linked to tears growing front to back.²⁹ Smokers more often had larger tears, and the more cigarettes smoked, the larger the tears tended to be.³⁰ Years of work with the arms above shoulder height were linked to more supraspinatus damage.³¹ Stopping smoking removes one factor linked to larger tears, keeping diabetes well controlled may help, and cutting back on prolonged overhead work reduces strain on the tendon.

Some questions to bring to your doctor about your own tear:

How large is it, and has it pulled back?
Is the muscle showing fat or shrinkage yet?
Is more than one tendon involved?
Would a repeat scan in some months help track it?

Can Physical Therapy Work Without Surgery

Across many groups treated with exercise, around 8 in 10 people improved in pain, movement, strength and function.³² Improvements can show up within 12 weeks of therapy.³³ In one long study, gains from a therapy program were reached within the first year and held steady for 10 years.³⁴ About 15% of people were not satisfied and went on to surgery.³⁵

A typical program starts with gentle range-of-motion work to ease stiffness. It then moves to strengthening the remaining cuff muscles and the shoulder blade muscles, progressing gradually over about three months, with exercises continued at home. The aim is to teach the surrounding muscles to take over the torn tendon’s job.

Stronger, better coordinated muscles around the tear hold the ball in the socket better, and better control of the shoulder blade makes lifting the arm more efficient. Pain often settles as the shoulder moves more smoothly, even when the gap in the tendon is unchanged.

People with tears that came on gradually, with modest weakness and no sudden injury, are the ones for whom therapy is most often recommended first. It is a reasonable first step even for large tears, though results tend to be less predictable. A fair trial usually means committing to about three months, since early sessions may feel slow. Therapy may not be working well enough if weakness keeps you from lifting the arm despite weeks of effort, if pain still wrecks your sleep after a fair trial, or if scans show the tear clearly growing.

Steroid injections have a place too. In one study, a steroid injection directly into a supraspinatus tear eased pain and improved function for at least 6 months without the tear enlarging.³⁶ A steroid injection can briefly change the makeup of tendon tissue, so it is wise to avoid heavy loading of the shoulder soon after one.³⁷

When Surgery Makes Sense and How Well It Holds

Across many studies, roughly 15 to 21% of repairs had come apart again, a retear, on later scans.³⁸ For small to medium supraspinatus tears, about 9 in 10 repairs healed.³⁹ For large and massive tears, retear rates of 50 to 94% have been reported, especially with poor tissue.⁴⁰ Age matters as well: the risk of retear roughly doubled from 15% at age 50 to 31% at age 70.⁴¹

A retear means the repaired tendon has separated from the bone again, usually found on a scan. Many people with one still have less pain and better function than before surgery, so a scan result is not the same as a bad outcome. A retear may be smaller than the original tear, which may help explain why some people stay comfortable. Add-ons like platelet-rich plasma or bone marrow concentrate may help the tendon heal structurally, but have not been shown to make people feel or function better long term.⁴²

Surgery tends to suit younger, active people whose tendon is still in good shape, and those whose tear followed a clear injury. It also suits people who have not improved after a fair therapy trial.

Timing matters most after a sudden injury. For tears caused by a sudden injury, early repair gave better pain relief and function, and far fewer retears, 2.6% versus 16.7%, than delayed repair.⁴³ For tears that developed gradually through wear, waiting before repair made no difference to results.⁴⁴ So after a fall or sudden lift with immediate weakness, it is worth seeing a specialist within weeks rather than months. For a gradual tear, waiting does not usually harm outcomes, but muscle changes over years can make a later repair harder.

What Recovery After Repair Looks Like

Recovery runs for months. You spend about the first several weeks in a sling while the therapist moves the arm for you. Active movement on your own follows as healing allows, and strengthening usually starts around three months. Return to heavy lifting or sport often takes six months to a year.

The pace of early movement is a real trade-off. Moving the shoulder early after repair improves range of motion but raises the risk of the repair coming apart.⁴⁵ Delaying movement led to higher healing rates and better shoulder scores at a year.⁴⁶

The repaired tendon is held to bone by stitches and anchors, and it takes months to knit biologically. Pain relief usually arrives long before the tendon is strong, which tempts people to do too much too soon. Lifting, reaching behind you or pushing up from a chair with the operated arm are common ways people accidentally overload an early repair.

Some preparation helps. Arrange help at home for daily tasks while one arm is in a sling, plan to sleep semi-upright for a while, and ask when you can drive and return to work.

The benefits reach beyond the shoulder. In one study, a year after repair, depression fell from about 23% to 6% and insomnia from 70% to 43%.⁴⁷ Timing of repair affects the length of recovery too: full recovery after delayed repair of injury-related tears took close to three years in one study, versus about a year with early repair.⁴⁸