SLAP tear

What it means

SLAP stands for Superior Labral tear, Anterior to Posterior — a tear across the top (superior) part of the labrum, the ring of tough cartilage rimming the shoulder socket, running from the front (anterior) of that top point to the back (posterior). This particular spot is important because it's also where the tendon of the long head of the biceps muscle attaches to the labrum, so a SLAP tear often involves some strain or fraying at that biceps anchor point as well as the cartilage ring itself.

Why it appears on a CT or MRI report

MRI, often combined with a contrast dye injected into the joint (an MR arthrogram), is the standard way to see a SLAP tear clearly, since the dye outlines the labrum and highlights any split or separation. Reports typically grade the tear using a numbered classification (commonly type I through IV, with type II — a labrum detached from the underlying bone — being the most frequently treated), describe how far around the labrum the tear extends, and note whether the biceps tendon anchor is involved or shows separate fraying.

What it usually means

SLAP tears are especially associated with repetitive overhead motion — baseball pitchers, swimmers, volleyball and tennis players, and manual laborers who work with their arms raised — because that motion repeatedly twists and loads the exact spot where the biceps tendon pulls on the labrum. They can also occur suddenly from a fall onto an outstretched arm or a forceful pull on the arm. Importantly, imaging studies of pain-free shoulders, especially in older adults and overhead athletes, regularly find SLAP tears with no symptoms whatsoever, so the presence of a tear on a report doesn't automatically explain shoulder pain or require treatment. When a SLAP tear is genuinely the cause of symptoms, it typically produces deep, poorly localized shoulder pain, a catching or popping sensation with certain arm positions, and reduced throwing or lifting power. Many symptomatic tears improve with a structured physical therapy program aimed at the shoulder's stabilizing muscles; surgical repair is generally reserved for tears that keep causing mechanical symptoms or weakness despite a real trial of conservative treatment, particularly in athletes who need to return to overhead sport.

When to follow up

If a SLAP tear is noted incidentally and your shoulder feels fine, it typically doesn't need treatment on its own. See a doctor or sports medicine specialist if you have persistent deep shoulder pain, a catching or locking sensation, a noticeable drop in throwing or lifting strength, or shoulder pain that isn't improving after a few weeks of rest and modified activity. Sudden, severe pain after a fall or forceful pull, or a shoulder that feels unstable or gives way, should be evaluated promptly.

A plain-language way to picture it

Picture the labrum as a rubber gasket lining the rim of a bowl, and imagine a rope (the biceps tendon) tied to one specific point at the top of that gasket. Every time you pull hard on the rope — reaching overhead, throwing, swimming — it tugs at that anchor point. Do that thousands of times and the gasket can start to peel away from the bowl right where the rope is tied, which is exactly the top-of-the-rim, front-to-back tear that gives the SLAP tear its name.