Shoulder

Posterior Labral Tear

Posterior labral tears are a less common but clinically important cause of shoulder pain and instability, frequently seen in baseball players, football linemen, and weightlifters whose activities load the posterior shoulder. At Maryland Orthopedic Specialists, our sports medicine surgeons are experienced in identifying posterior instability and tailoring treatment — from focused physical therapy to arthroscopic labral repair — for each athlete's demands.

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What is posterior labral tear?

The glenoid labrum is a fibrocartilaginous rim that deepens the relatively flat shoulder socket (glenoid), increases contact area with the humeral head, and anchors the glenohumeral ligaments. While anterior labral tears (Bankart lesions) dominate in the setting of anterior shoulder dislocations, posterior labral tears involve the posterior quadrant of the labrum and produce posterior shoulder instability or pain.

The glenoid labrum is a fibrocartilaginous rim that deepens the relatively flat shoulder socket (glenoid), increases contact area with the humeral head, and anchors the glenohumeral ligaments. While anterior labral tears (Bankart lesions) dominate in the setting of anterior shoulder dislocations, posterior labral tears involve the posterior quadrant of the labrum and produce posterior shoulder instability or pain.

Mechanisms and Associated Names

"Batter's shoulder": The follow-through of a baseball swing loads the posterior labrum in internal rotation; repeated exposure in batters leads to progressive posterior labral damage.
Bench press and pushing/blocking injuries: Anterior-to-posterior directed forces (heavy bench press, football offensive line blocking) compress and shear the posterior labrum against the glenoid rim.
Posterior shoulder dislocations: Traumatic posterior dislocations can avulse the posterior labrum (reversed Bankart or "Kim lesion").
Kim lesion: An incomplete posterior labral avulsion described by Kim et al.; the dominant labral injury pattern in posterior instability without frank dislocation.
Posterior SLAP extension: Superior posterior labral tears that extend from a SLAP injury.

Posterior vs. Anterior Instability

Posterior instability is functionally distinct from the more familiar anterior instability. Patients rarely dislocate dramatically; instead, they experience posterior subluxation events — a feeling of the shoulder slipping or "going out" with specific loading positions, particularly forward flexion combined with internal rotation and adduction (the classic provocative position).

Treatment options

Physical Therapy

PT is the mainstay for most posterior labral tears. A program targeting posterior rotator cuff strengthening (infraspinatus, teres minor), scapular stabilization, and posterior capsular stretching (addressing any posterior tightness that increases internal impingement) resolves symptoms in the majority of patients without surgery. Athletes should avoid provocative loading positions during rehabilitation.

Surgical Procedure

Bankart Repair (Shoulder Instability)

Arthroscopic suture anchor repair of the anterior-inferior glenoid labrum to restore the primary capsuloligamentous restraint against anterior dislocation. Appropriate when glenoid bone loss is below 20–25% — above that, the Latarjet is preferred.

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Shoulder Arthroscopy (Diagnostic & Operative)

Minimally invasive diagnostic and operative scope of the glenohumeral joint and subacromial space, used to evaluate and treat labral tears, rotator cuff pathology, AC joint arthritis, loose bodies, and synovitis.

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Frequently Asked Questions

Is posterior instability as common as anterior?

Anterior instability is far more common (80–95% of shoulder instability cases). Posterior instability accounts for 2–5% of cases but is underdiagnosed because it rarely involves frank dislocation.

Can I keep playing sports without surgery?

Many athletes successfully manage posterior instability with strengthening programs. Surgery is reserved for those with persistent symptomatic instability despite rehabilitation.

What is the difference between a posterior labral tear and a SLAP tear?

A SLAP tear involves the superior (top) labrum at the biceps anchor. A posterior labral tear involves the back portion of the labrum. They can coexist and are both visible on MRI arthrogram.

How long is recovery after posterior labral repair surgery?

After arthroscopic posterior labral repair, the shoulder is typically immobilized in a sling for 4–6 weeks to allow the repaired tissue to heal to the bone. Physical therapy begins with gentle passive motion and gradually progresses to strengthening over the following months. Most patients return to recreational sports at 4–6 months, while overhead athletes and contact sport players typically require 6–9 months before returning to full competition. At MOS, your rehabilitation timeline is individualized based on the number of anchors placed, tissue quality, and your sport-specific demands.

Who is most at risk for a posterior labral tear?

Posterior labral tears are most commonly seen in athletes who perform repetitive follow-through motions — such as quarterbacks, tennis players, and swimmers — or those who sustain a direct blow to the front of the shoulder pushing it backward. Weightlifters and football linemen who bear heavy axial loads with the arm in front of them (bench press position) are also at elevated risk. Unlike anterior labral tears, posterior tears are less commonly caused by a shoulder dislocation. Your MOS surgeon will evaluate your specific mechanism of injury and shoulder anatomy to confirm the diagnosis and guide treatment.