What Is Shoulder Instability?
Shoulder instability is a condition in which the structures that normally keep the humeral head centered within the glenoid socket — primarily the labrum, capsular ligaments, and rotator cuff — are stretched, torn, or insufficient. The result is a shoulder that dislocates (the ball comes fully out of the socket), subluxates (the ball partially slips out before returning), or simply feels unreliable during everyday activities and sport.
The glenohumeral joint is the most mobile joint in the human body, a design that trades inherent bony stability for an extraordinary range of motion. That mobility comes at a cost: the shoulder depends heavily on its soft-tissue restraints, and when those are damaged — usually by a traumatic dislocation or repetitive overhead stress — instability follows. Dr. Jay Levin at Duke Health in Durham, NC, specializes in restoring shoulder stability using the most advanced arthroscopic and open surgical techniques available, serving patients from Cary, Raleigh, Chapel Hill, and across North Carolina.
Causes
Shoulder instability develops through several distinct mechanisms:
Traumatic instability is the most common form. A fall onto an outstretched arm, a direct blow, or a forceful throwing motion can pull the humeral head out of the socket, tearing the labrum and stretching the anterior capsular ligaments. This injury — a Bankart lesion — leaves the shoulder vulnerable to re-dislocation. Repeated dislocations can erode the front edge of the glenoid socket (bone loss), making the problem progressively harder to treat.
Atraumatic and multidirectional instability occurs in patients with generalized ligamentous laxity — naturally loose connective tissue — combined with shoulder muscle weakness. These patients often have no single defining injury; instead they experience gradual onset of the sensation that the shoulder slips in multiple directions.
Repetitive microtrauma from overhead sports (swimming, volleyball, baseball pitching, tennis) can stretch the capsular ligaments over time, producing instability in competitive athletes without a discrete traumatic event.
When to See a Specialist
Seek evaluation with a shoulder specialist if you experience:
- A shoulder dislocation that required reduction in an emergency department or by a medical professional
- Recurrent episodes in which the shoulder feels like it "pops out" and then "pops back in"
- Persistent apprehension — a fear or expectation that the shoulder will dislocate — when reaching overhead or behind the back
- Shoulder pain that is preventing you from returning to sport, work, or daily activities
Prompt evaluation is particularly important for young athletes. Each dislocation causes additional damage to the labrum and potentially to the glenoid bone, narrowing the window for the most effective surgical options.
Treatment Options at Duke Health
Dr. Jay Levin takes a personalized approach to shoulder instability at Duke Health in Durham, NC, matching the treatment to the underlying anatomy, bone stock, and the patient's activity level and goals.
Nonsurgical treatment is appropriate for first-time dislocators who are older, less active, or who have multidirectional instability without significant structural damage:
- Immobilization immediately after dislocation
- Physical therapy emphasizing rotator cuff and scapular stabilizer strengthening
- Activity and sport modification during rehabilitation
Surgical treatment is recommended for patients with recurrent instability, significant bone loss, failed conservative care, or high-demand athletes seeking the lowest possible recurrence risk. Dr. Levin performs:
- Arthroscopic Bankart repair — Reattaches the torn labrum and tightens the anterior capsule using small suture anchors, restoring the labral bumper that prevents anterior dislocation. Low recurrence rates in appropriately selected patients with good bone stock.
- Latarjet procedure — Transfers the coracoid bone block to the front of the glenoid to simultaneously enlarge the socket and create a muscular sling. Preferred for patients with glenoid bone loss, contact athletes, or after failed arthroscopic repair.
- Capsular plication and thermal-assisted capsulorrhaphy — Tightens a redundant, multidirectionally lax capsule in patients with atraumatic instability who have failed rehabilitation.
- Posterior stabilization — Addresses posterior labral tears and capsular laxity in patients with posterior instability, common in linemen and weight-lifters.
Following surgery, patients participate in a structured rehabilitation program designed to restore full motion and strength before returning to sport, typically over a 5–6 month timeline.