A glenoid labrum tear is a rip in the ring of cartilage that lines the shoulder socket, compromising the joint’s stability and often causing pain, clicking, or a feeling that the shoulder might slip out of place. The labrum deepens the shallow shoulder socket by roughly 50%, so when it tears, the joint loses a significant portion of its built-in security system.
What the Labrum Does
Your shoulder is a ball-and-socket joint where the upper arm bone (the ball) meets a shallow dish on the shoulder blade (the socket). Unlike the hip, which has a deep, snug socket, the shoulder socket is comparatively flat. This tradeoff gives you an enormous range of motion but leaves the joint inherently unstable.
The glenoid labrum is a thick rim of fibrous cartilage that wraps around the entire edge of that shallow socket. It serves several roles at once: it increases the depth and surface area of the socket, helps center the ball of the arm bone, and creates a seal that maintains pressure inside the joint. It also serves as an anchor point for ligaments and, at the top of the socket, the biceps tendon. When part of the labrum tears away or frays, one or more of these stabilizing functions breaks down.
Types of Labrum Tears
Labral tears are classified by where on the socket rim they occur, and each location has a different name and set of consequences.
- Bankart lesion. A tear of the lower front (anterior-inferior) portion of the labrum. This is the most common result of a shoulder dislocation. When the arm bone pops forward out of the socket, it shears the labrum off the rim. A Bankart lesion is considered the “essential lesion” of shoulder instability because, without it repaired, the shoulder tends to dislocate again.
- SLAP tear. Short for “superior labrum anterior to posterior,” a SLAP tear occurs at the top of the socket where the biceps tendon attaches. The labrum peels away from back to front, sometimes pulling the biceps anchor with it. SLAP tears are especially common in overhead athletes.
- Posterior labral tear. Less common, this involves the back of the labrum and can result from repetitive stress or a fall onto an outstretched arm.
In some cases, tears span more than one zone. A type V SLAP lesion, for instance, combines a Bankart lesion at the bottom with a SLAP tear at the top, creating a large, continuous strip of detached labrum.
Common Causes
Labral tears generally fall into two categories: acute trauma and repetitive wear.
A single forceful event, like a shoulder dislocation, a fall onto an outstretched hand, or a direct blow during contact sports, can rip the labrum off the bone in an instant. Falls are a particularly common mechanism in older adults, whose cartilage becomes more brittle with age.
Repetitive overhead motion is the other major cause. Baseball pitchers, volleyball players, and lacrosse athletes put enormous rotational stress on the top of the labrum with every throw or swing. Over time, this repetitive loading frays and eventually detaches the tissue. Swimmers and tennis players face similar risks. The term “overhead athletes” comes up frequently in labral injury discussions for this reason.
Degenerative tears can also develop gradually in people who aren’t athletes. Normal aging weakens cartilage, and years of routine shoulder use can cause the labrum to fray, particularly along the top of the socket.
What a Labrum Tear Feels Like
The hallmark symptoms, according to the American Academy of Orthopaedic Surgeons, include:
- A sense of instability, as though the shoulder could slip out of place
- Deep, hard-to-pinpoint shoulder pain that worsens with overhead activities
- Catching, locking, popping, or grinding during movement
- Occasional night pain or pain with everyday tasks like reaching into a cabinet
- Decreased range of motion
- Loss of strength
Not every tear produces all of these symptoms. Small degenerative tears may cause only intermittent clicking, while a large Bankart lesion after a dislocation typically causes obvious instability and significant pain. Some tears are found incidentally on imaging and cause no symptoms at all.
How Labrum Tears Are Diagnosed
Diagnosis starts with a physical exam. Your doctor will move your arm into specific positions designed to stress the labrum and reproduce your symptoms. Several named tests exist for this purpose, but their accuracy varies widely depending on the examiner and the patient. One widely used test, the active compression test, showed sensitivity as high as 100% in its original study but dropped to 47% when evaluated independently. No single physical exam maneuver is reliable enough on its own to confirm or rule out a labral tear.
Imaging fills that gap. A standard MRI can detect labral tears with about 76% sensitivity and 87% specificity. The more accurate option is an MR arthrogram (MRA), where contrast dye is injected into the joint before scanning. The dye outlines the labrum and seeps into any tears, boosting sensitivity to 88% and specificity to 93%. If your doctor suspects a labral tear, an MRA is typically the preferred study. Some tears, particularly those along the bottom of the socket, are difficult to see on any imaging and may only be confirmed during surgery.
Treatment Without Surgery
Many labral tears, especially degenerative ones and small SLAP tears in non-athletes, respond well to conservative treatment. The core of this approach is physical therapy focused on two goals: strengthening the rotator cuff muscles and stabilizing the shoulder blade.
Your rotator cuff is a group of four muscles that wrap around the joint and act as dynamic stabilizers. When the labrum is compromised, these muscles can compensate by holding the arm bone more firmly in the socket. Therapy typically includes resistance exercises for shoulder rotation and scapular stabilization drills. Anti-inflammatory medications and activity modification (temporarily avoiding the motions that provoke pain) round out the approach. For many people, several months of consistent rehab reduces symptoms enough that surgery becomes unnecessary.
When Surgery Is Needed
Surgery becomes the better option when conservative treatment fails, when the shoulder continues to dislocate, or when an athlete needs to return to overhead sports at full capacity. Most labral repairs are done arthroscopically, through small incisions using a camera and specialized instruments. The surgeon reattaches the torn labrum to the bone rim using small anchors and sutures.
The specific approach depends on the type and extent of the tear. A Bankart repair reattaches the front-bottom labrum to prevent recurrent dislocations. A SLAP repair secures the top of the labrum and the biceps anchor. Extensive tears that wrap around more than half the socket require advanced techniques and multiple anchor points. In some cases, particularly in older patients with degenerative SLAP tears, the surgeon may simply trim the damaged tissue (debridement) or cut the biceps tendon free from its labral attachment and reattach it elsewhere, rather than attempting a full repair.
Recovery After Surgery
Recovery from arthroscopic labral repair follows a gradual, staged timeline. You’ll wear a sling for one to six weeks, depending on the size of the repair and your surgeon’s preference. During this early phase, gentle passive range of motion (someone else moves your arm for you) is usually allowed.
Active motion, where you move your own arm, typically starts between three and nine weeks after surgery. Strengthening exercises begin later, anywhere from a few weeks to about four months post-op. The variation in these timelines reflects differences in tear severity, repair technique, and individual healing.
For athletes, the road back is longer than many expect. Return to sport happens at three to six months in straightforward cases, but overhead athletes, particularly throwers, often need four and a half to seven months before they begin a structured throwing program. Across published studies, the average time to return to sport is approximately nine months. About 69% of athletes return to their previous level of play, meaning roughly one in three do not fully regain their pre-injury performance. That statistic is worth weighing carefully if you’re deciding between surgery and activity modification.
Long-Term Risks of Untreated Tears
A labral tear that causes recurrent instability or dislocations can damage the joint surfaces over time. Each dislocation risks chipping the bone of the socket or the arm bone, making future dislocations easier and repair more complicated. Chronic joint instability also accelerates cartilage wear, increasing the likelihood of developing osteoarthritis in the shoulder years down the line. Small, stable tears that don’t cause instability carry less long-term risk, which is why not every tear needs surgical repair.