A torn rotator cuff is a rip in one or more of the four tendons that hold your shoulder joint together and allow it to move. It’s one of the most common shoulder injuries, affecting between 7% and 22% of people over age 40, and the risk climbs with every decade of life. Up to half of people over 80 have a rotator cuff tear, though many never feel a thing.
The Four Muscles That Make Up the Rotator Cuff
Your rotator cuff is a group of four muscles and their tendons that wrap around the head of your upper arm bone, anchoring it into the shallow socket of your shoulder blade. Each muscle has a specific job. The supraspinatus sits on top and helps you lift and rotate your arm. The subscapularis, on the front side, lets you hold your arm out away from your body. The infraspinatus, along the back, handles outward rotation. And the teres minor, attached to the outer edge of your shoulder blade, assists with turning and rotating the arm.
Together, these four muscles act like a cuff around the ball of the joint, keeping it centered in the socket during movement. When one or more of these tendons tears, the shoulder loses both strength and stability.
Partial vs. Full-Thickness Tears
Not all rotator cuff tears are the same. A partial-thickness tear means some of the tendon fibers are damaged but the tendon is still connected. Think of it like a frayed rope that hasn’t snapped all the way through. A full-thickness tear goes all the way through the tendon, creating a hole. In severe cases, the tendon pulls completely away from the bone.
Partial tears can progress to full tears over time, especially if the shoulder continues to be stressed. But progression isn’t inevitable. Many partial tears remain stable for years, particularly with appropriate management.
What Causes a Tear
Rotator cuff tears fall into two broad categories: traumatic and degenerative. A traumatic tear happens suddenly, often from a fall onto an outstretched hand, lifting something too heavy with a jerking motion, or a direct blow to the shoulder. These tears are common in younger, active people and athletes.
Degenerative tears are far more common. They develop gradually as the tendon wears down over years of repetitive use. Blood supply to the rotator cuff tendons naturally decreases with age, which slows the body’s ability to repair small amounts of daily damage. Over time, this accumulation of micro-damage weakens the tendon until it partially or fully tears, sometimes without a single identifiable injury. Jobs or hobbies involving repetitive overhead motion, such as painting, carpentry, swimming, or tennis, accelerate this process.
How a Torn Rotator Cuff Feels
The hallmark symptom is a dull ache deep in the shoulder. Unlike a sharp, surface-level pain, it often feels like it’s coming from inside the joint. This ache commonly worsens at night, particularly when you lie on the affected side, making sleep difficult. Everyday tasks like combing your hair, reaching behind your back, or lifting objects away from your body can become painful or impossible.
Arm weakness is the other major sign. You might notice you can’t hold your arm in certain positions or that your grip feels unreliable. With a traumatic tear, these symptoms appear suddenly and intensely. With a degenerative tear, they creep in over weeks or months, sometimes so gradually that you don’t realize how much function you’ve lost until you try something specific.
It’s worth noting that many tears produce no symptoms at all. MRI scans of people with no shoulder complaints found full-thickness tears in about 10% of individuals with an average age of 44. Since fewer than 5% of people with rotator cuff tears ever need surgery, the majority are either painless or mild enough to manage without an operation.
How Tears Are Diagnosed
Diagnosis starts with a physical exam. Your doctor will move your arm into specific positions to test for weakness and pain. In the drop arm test, you slowly lower a raised arm; if you can’t control the descent, it suggests a tear. Lag sign tests check whether you can hold your arm in a rotated position after the doctor places it there. If your arm drifts back, that points to a full-thickness tear in a specific muscle. The painful arc test, where pain flares as you raise your arm through a particular range, helps identify impingement and underlying cuff damage.
No single physical exam test is definitive on its own, so imaging usually follows. Both MRI and ultrasound are highly accurate for detecting full-thickness tears, with sensitivity around 92% and specificity between 93% and 94% for each. For partial tears, both methods are less reliable, catching roughly two-thirds of cases. Your doctor may choose one over the other based on availability and cost. Ultrasound has the advantage of being done in real time during a clinic visit, while MRI provides a more detailed picture of surrounding structures like bone and cartilage.
Treatment Without Surgery
Many rotator cuff tears respond well to nonsurgical treatment, especially degenerative tears in older adults. The core of conservative management is physical therapy focused on strengthening the remaining rotator cuff muscles and the muscles around the shoulder blade. When the surrounding muscles compensate effectively, the shoulder can regain much of its function even with a tear still present.
Rest from aggravating activities, anti-inflammatory medications, and steroid injections can help manage pain during the early phase. The goal isn’t necessarily to heal the tear itself, since tendons have limited blood supply and don’t always repair on their own, but to reduce pain and restore usable strength and range of motion.
When Surgery Makes a Difference
A five-year follow-up study comparing surgical and nonsurgical treatment found that both groups had similar outcomes for the first 18 months. After that point, surgically treated patients pulled ahead, showing significantly better pain and function scores that held steady through the five-year mark. Women and people with traumatic tears benefited the most from surgery.
This doesn’t mean everyone should opt for surgery. For older adults with degenerative tears and modest symptoms, physical therapy may provide all the relief they need. But for younger patients, those with acute traumatic tears, or anyone who hasn’t improved after several months of rehab, surgical repair tends to produce better long-term results.
Arthroscopic repair, done through small incisions with a camera, and mini-open repair, which uses a slightly larger incision, produce equivalent outcomes. Re-tear rates, range of motion, pain scores, and complication rates are comparable between the two techniques. Your surgeon’s experience and the specifics of your tear typically determine which approach is used.
What Recovery Looks Like After Surgery
Recovery from rotator cuff repair is slow and structured. For the first six weeks, you’ll wear a sling with a small pillow to keep the arm slightly away from your body. The sling can come off for showers and specific exercises your therapist prescribes, but it stays on in uncontrolled environments: around crowds, children, pets, and while sleeping.
At around eight weeks, you can begin gentle isometric exercises, where you contract the muscles without actually moving the joint. These build early strength without stressing the healing tendon. At 12 weeks, you progress to resistance exercises using elastic bands or light weights. Full recovery to unrestricted activity typically takes four to six months, though some people continue gaining strength for up to a year.
The most important factor in surgical outcomes is following the rehab protocol. Pushing too hard too early risks re-tearing the repair. Moving too cautiously can lead to stiffness and adhesive capsulitis, where the shoulder capsule tightens and freezes. The rehab timeline exists to balance these two risks.