How does a doctor tell if you have a torn rotator cuff?

How Doctors Diagnose a Torn Rotator Cuff

When shoulder pain lingers, especially after lifting or repetitive motion, one common culprit is a rotator cuff tear. But how do doctors confirm it? It starts with a physical exam—your doctor will assess your range of motion, strength, and tenderness in the shoulder. But to see what’s really going on beneath the surface, they turn to imaging.

X-rays won’t show soft tissue damage, so they can’t reveal a torn rotator cuff directly. However, they’re still useful. Your doctor might order one to rule out other issues like bone spurs or arthritis, which can mimic rotator cuff symptoms or contribute to the injury over time.

The real clarity comes from an MRI (magnetic resonance imaging) scan. This detailed imaging test gives a clear picture of the soft tissues in your shoulder, including tendons and muscles. With an MRI, your doctor can identify whether you have a tear, and if so, determine if it’s partial—meaning the tendon is frayed or damaged but not completely severed—or a full-thickness tear, where the tendon is split or detached from the bone.

In some cases, an ultrasound may also be used. It’s less expensive than an MRI and allows real-time visualization of the shoulder’s moving structures, making it a practical alternative in certain situations.

Early and accurate diagnosis is key to effective treatment. Whether it’s rest, physical therapy, or surgery, knowing the extent and type of tear helps your doctor tailor a plan that gets you back to moving comfortably. So if your shoulder won’t cooperate, don’t ignore it—getting the right test could be the first step toward real relief.