The glenoid labrum is a ring of dense fibrocartilage attached around the shoulder socket’s rim, which enhances a naturally shallow joint. Without it, the contact between the humeral head and glenoid would be minimal, making the ball-and-socket joint resemble a golf ball resting on a tee. The labrum essentially doubles the socket’s depth, acts as an attachment site for the glenohumeral ligaments, and serves as an anchor for the long head of the biceps tendon at the top.
When the labrum is torn, frayed, or detached, it weakens the shoulder’s overall structure beyond just the labrum. This can lead to ligament laxity, impaired joint proprioception, and changes in humeral head tracking. These issues put extra stress on the rotator cuff, cartilage, and joint capsule. If not treated, labral problems often worsen and cause more extensive damage.
A labral tear’s location and cause influence how it presents clinically and its treatment options.
SLAP tears, standing for Superior Labrum Anterior to Posterior, affect the upper part of the labrum at the bicep’s tendon anchor. They are frequently seen in overhead athletes and can cause deep shoulder pain, mechanical issues, and a decline in throwing speed or stamina. Since the biceps long head attaches in this area, SLAP tears often occur alongside bicipital tendinitis.
Bankart lesions are characterized by anterior-inferior labral detachment and are a key indicator of traumatic anterior shoulder dislocation. When the humeral head is forcibly pushed forward, it tears the anteroinferior labrum from the glenoid rim, resulting in a lesion that weakens the shoulder’s main defense against future anterior dislocations. Young patients experiencing a first-time traumatic dislocation are at high risk of recurrence—especially if no surgical stabilization is performed—since an unrepaired Bankart lesion cannot restore the static stability it once provided.
Degenerative labral fraying happens gradually without a specific traumatic event. It is common in adults over age 40 and results from cumulative microtrauma and tissue aging. Often, it is found incidentally during imaging performed for other issues. When symptomatic, degenerative tears frequently occur alongside rotator cuff problems or glenohumeral osteoarthritis.
The way labral injuries occur depends on the type of injury. Traumatic injuries happen suddenly due to high-energy events, such as a shoulder dislocation from a fall or collision, a forceful pull on an outstretched arm, or a direct blow that briefly displaces the humeral head.
Repetitive microtrauma primarily affects overhead athletes. Activities like throwing, serving, and swimming repeatedly put the labrum under cyclic tensile and compressive forces, especially during extreme external rotation and follow-through motions. After hundreds of repetitions, the labrum’s attachment to the glenoid rim may weaken and eventually fail, leading to a SLAP tear or posterior labral injury, depending on the dominant force direction.
Chronic degenerative change occurs when the labrum gradually loses its resilience. As it stiffens and can no longer deform elastically, repetitive daily joint loads cause greater damage. Contributing factors include:
Labral tears can cause various symptoms depending on the tear’s location, severity, and the level of associated instability.
Deep shoulder pain is common, and almost everyone experiences it. It is usually triggered by movements involving reaching overhead, crossing the body, or positions that stretch the shoulder to its maximum rotation. Unlike rotator cuff pain, which usually feels like a specific pain in the front or side of the shoulder, labral pain often presents as a diffuse, hard-to-pinpoint ache inside the joint.
Mechanical symptoms are key to diagnosis. A catching or clunking feeling during arm movement, or sharp pain during certain motions, suggests that some tissue inside the joint is being intermittently trapped or compressed. True locking — the inability to finish a movement arc — is less common but indicates major intra-articular damage.
Instability is the most clinically significant symptom. Patients with Bankart lesions often report a sensation of the shoulder slipping out of place during activities involving overhead reaching or external rotation. Repeated episodes of subluxation or dislocation are the most severe signs of this instability. Conversely, SLAP tears more commonly cause pain and mechanical symptoms rather than major instability.
Weakness and decreased endurance during repeated overhead activities are common, stemming from pain inhibition and the labrum’s role in providing proprioceptive feedback within the joint.
Labral injuries affect a broad demographic. Traumatic Bankart lesions are especially common in men under 30, as their increased activity levels and frequent participation in contact and collision sports heighten their risk for glenohumeral dislocation. The recurrence rate after an initial traumatic dislocation in this age group is among the highest reported in orthopedic studies.
SLAP tears impact overhead athletes of various ages, especially baseball pitchers, volleyball players, swimmers, and tennis players. Degenerative labral fraying tends to increase after age 50 and is often an incidental finding on shoulder MRI in older adults.
An untreated labral tear doesn’t stay the same. The initial damage alters the joint’s biomechanics, placing additional stress on nearby structures. When the labrum detaches, the glenohumeral ligaments, which rely on the labrum, become less effective, decreasing passive restraint and allowing more humeral head movement. Repeated subluxations due to untreated Bankart lesions gradually wear down the glenoid rim, leading to bony loss that makes surgical repair more challenging.
Secondary rotator cuff damage is a common complication resulting from prolonged shoulder instability. The rotator cuff compensates for insufficient passive joint stabilization, and over time, this chronic workload can lead to tendinopathy and partial tears. Additionally, the articular cartilage on the glenoid and humeral head becomes susceptible to abnormal contact stresses caused by a poorly centered humeral head, which can lead to early glenohumeral osteoarthritis.
Labral pathology is diagnosed using both clinical examination and imaging techniques. The examiner conducts provocation tests tailored to the labrum, such as the O’Brien active compression test for SLAP tears, the anterior apprehension and relocation tests for Bankart instability, and the Kim test for posterior labral injury. While these tests are useful clinically, they do not provide definitive information about the type or severity of the tear.
MRI arthrography, which involves injecting contrast material directly into the joint before imaging, is the most sensitive method for detecting labral tears and evaluating their extent. Standard MRI offers useful insights into related issues such as rotator cuff tears, joint effusion, and cartilage degradation. Although diagnostic ultrasound is less effective at directly visualizing the labrum because of its depth within the joint, it provides valuable real-time imaging of the rotator cuff, biceps tendon, and joint capsule, and is useful for guiding therapeutic injections when needed.
Treatment choices for labral injury depend on the type of tear, degree of instability, the patient’s activity level and functional needs, and any additional structural issues.
Conservative management suits many degenerative and partial labral tears, especially in older patients or those lacking significant instability. Targeted physiotherapy emphasizes strengthening the rotator cuff and scapular stabilizers to enhance dynamic stability, lessening the dependence on passive restraint structures. During rehabilitation, activity modification helps decrease stress on the healing tissue.
If symptoms continue despite standard rehabilitation, regenerative therapies can be considered. Platelet-Rich Plasma (PRP) therapy involves injecting concentrated autologous growth factors into the joint to promote tissue healing and reduce inflammatory signals that hinder recovery. Low-Level Light Therapy (LLLT) may be used as a non-invasive complement to help cellular recovery and decrease ongoing inflammation in surrounding soft tissues. In cases of partial labral tears or degenerative fraying, therapies such as MSC-derived exosome therapy or stem cell therapy might be evaluated to enhance the biological environment for tissue repair.
Extracorporeal Shockwave Therapy (ESWT) can be relevant when a labral injury occurs alongside rotator cuff tendinopathy, which is common in overhead athletes.
Surgical repair is the preferred treatment for severe instability, complete Bankart lesions with recurrent dislocation, and labral tears unresponsive to conservative therapy. Arthroscopic labral repair or reconstruction restores the passive stability provided by the labrum-ligament complex and, when performed in suitable patients, effectively reduces the risk of recurrence of instability