Shoulder

Posterior Labral Tear

Q: 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.

Q: 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.

Q: 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.

Q: Why are posterior labral tears sometimes missed?

They may cause pain rather than a dramatic dislocation, and standard imaging can be subtle. A careful history, posterior-instability examination, and appropriately selected MRI or MRI arthrogram help connect the imaging finding to the symptoms.

Q: When is surgery considered?

Surgery may be considered when persistent pain or instability limits daily activity or sport despite an appropriate rehabilitation program, and the examination and imaging identify a repairable posterior labral injury. The plan is individualized for associated bone loss, capsular laxity, and sport demands.

A posterior labral tear affects the cartilage rim at the back of the shoulder socket. It may cause deep posterior pain, clicking, or a slipping sensation during pushing, blocking, bench pressing, or a batter's follow-through. Diagnosis can be subtle, so our shoulder surgeons match the history and examination with appropriate imaging before recommending treatment.

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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, producing a reverse Bankart lesion.
Kim lesion: A distinct, incomplete and sometimes concealed avulsion of the posteroinferior labrum that can occur without a 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).

Symptoms — do you recognize these?

Deep posterior shoulder pain, often worsened with overhead activities or pushing movements
Pain at the end of a baseball swing (batter's follow-through)
Pain with bench press, push-ups, or blocking movements
A sensation of shoulder slipping or giving way posteriorly
Clicking or clunking with shoulder motion
Pain or discomfort reaching across the body

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How we diagnose it

Physical Examination

Posterior Apprehension Test: With the patient supine, the shoulder is forward-flexed to 90° with the elbow bent; internal rotation and posteriorly directed force on the elbow produce apprehension or subluxation posteriorly.
Jerk Test: The arm is abducted to 90° and internally rotated; a posteriorly directed axial load while adducting the arm across the body produces a sudden "jerk" as the humeral head subluxates posteriorly over the glenoid rim, then reduces. A positive jerk test is highly specific for posterior instability.
Kim Test: Augments the jerk test with inferior force; increases sensitivity for posterior-inferior labral tears.
Load-and-Shift Test (posterior direction): Translates the humeral head posteriorly; excessive translation or a clunk suggests posterior labral insufficiency.

Imaging

X-rays: Usually normal in atraumatic posterior instability. They can identify a classic Hill-Sachs lesion on the posterolateral humeral head after anterior dislocation or a reverse Hill-Sachs lesion on the anteromedial humeral head after posterior dislocation.
MRI Arthrogram (preferred): Intra-articular gadolinium most reliably images posterior labral tears, which can be subtle on standard MRI. Axial cuts demonstrate posterior labral detachment, the Kim lesion (partial avulsion with fluid undermining), and posterior capsular redundancy.

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.

Arthroscopic Posterior Labral Repair

Arthroscopic posterior labral repair is indicated for patients who fail 3–6 months of structured PT with persistent posterior instability that impairs sport performance or daily function. Under arthroscopic visualization, the torn posterior labrum is mobilized, freshened at the glenoid rim, and secured with suture anchors (typically 2–3 anchors for isolated posterior labral tears). Posterior capsular plication may be added to address redundant capsule. Return to sport after posterior labral repair requires structured rehabilitation. Clearance varies by healing, sport, position, strength, and functional testing; contact athletes often need at least several months before unrestricted return.

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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Recovery & rehabilitation

PT alone: Return to sport typically 3–6 months; success in approximately 60–80% of patients without frank instability
Arthroscopic repair: Full contact sport return at 5–6 months; recurrent instability rates of <10–15% with proper technique

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.

Why are posterior labral tears sometimes missed?

They may cause pain rather than a dramatic dislocation, and standard imaging can be subtle. A careful history, posterior-instability examination, and appropriately selected MRI or MRI arthrogram help connect the imaging finding to the symptoms.

When is surgery considered?

Surgery may be considered when persistent pain or instability limits daily activity or sport despite an appropriate rehabilitation program, and the examination and imaging identify a repairable posterior labral injury. The plan is individualized for associated bone loss, capsular laxity, and sport demands.