Shoulder Instability & Dislocation: Physical Therapy vs. Surgery in Salt Lake City

Dr. Emily Warren, DPT treats shoulder instability and post-dislocation rehabilitation at Mindful Movement Physical Therapies in Holladay and Salt Lake City. No referral needed in Utah.

📞 Call: (385) 332-4939
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Quick Answer

Shoulder instability — whether from a traumatic dislocation, recurrent subluxations, or atraumatic multidirectional looseness — does not always require surgery. High-quality physical therapy that addresses the neuromuscular and dynamic stabilizing system of the shoulder is the evidence-based first-line treatment, particularly for multidirectional instability (MDI). For traumatic anterior instability with a Bankart lesion, the decision between conservative PT and surgical stabilization depends on age, activity level, number of dislocations, and lesion severity. This guide explains the landscape so you can make an informed decision.

Shoulder Anatomy and Why It’s Prone to Instability

The glenohumeral joint (shoulder) is a ball-and-socket joint with a fundamental design trade-off: maximum mobility at the cost of inherent bony stability. The glenoid fossa (socket) is shallow — it contacts only about 25–30% of the humeral head (ball) at any given time. This allows the extraordinary range of motion the shoulder needs for overhead activities and throwing, but it also means the shoulder depends heavily on soft tissue structures for stability.

The stabilizing system has two layers:

Passive Stabilizers (Static)

• Glenoid labrum: A fibrocartilaginous rim that deepens the socket by ~50%, acting like a suction cup around the humeral head. A Bankart lesion is a tear of the anteroinferior labrum — the most common injury in anterior dislocation.
• Glenohumeral ligaments (GHLs): Three ligament bands (superior, middle, inferior) that provide directional restraint. The inferior GHL complex (IGHLC) is the primary restraint to anterior instability at mid-range and overhead positions.
• Joint capsule: The overall fibrous envelope. Generalized capsular laxity — whether constitutional or acquired — is the hallmark of MDI.

Active Stabilizers (Dynamic)

• Rotator cuff (subscapularis, supraspinatus, infraspinatus, teres minor): More than force generators for shoulder motion, the rotator cuff creates a compressive force couple that keeps the humeral head centered in the glenoid. Rotator cuff neuromuscular dysfunction is a key driver of shoulder instability — and a primary rehabilitation target.
• Periscapular muscles (trapezius, serratus anterior, rhomboids): Control scapular position. A poorly positioned scapula reduces the depth of the shoulder socket — turning a stable contact area into an unstable one. Scapular dyskinesis is nearly universal in instability.
• Biceps long head: Provides secondary superior stability; becomes more important when the rotator cuff is compromised.

Types of Shoulder Instability

Traumatic Anterior Instability (Bankart Pattern)

The most common form — typically caused by a fall on an outstretched arm or a collision that forces the arm backward in abduction/external rotation. The humeral head displaces anteriorly, tearing the anteroinferior labrum (Bankart lesion) and stretching or avulsing the IGHLC. A Hill-Sachs lesion (compression fracture of the posterolateral humeral head from impact against the glenoid rim) often accompanies acute dislocations.

Key statistics:

• First-time dislocation: ~70% recurrence rate in patients under 25 with conservative treatment alone
• First-time dislocation: ~15–30% recurrence rate in patients over 40 with conservative treatment
• Age at first dislocation is the single strongest predictor of recurrence

Multidirectional Instability (MDI)

MDI is instability in more than one direction (anterior + posterior, or anterior + inferior + posterior), typically without a traumatic cause. It’s most common in young athletes — particularly gymnasts, swimmers, volleyball players, and overhead throwers — and in individuals with generalized ligamentous laxity (hypermobility, connective tissue disorders).

MDI rarely involves a discrete labral tear. The problem is generalized capsular redundancy plus poor dynamic stabilizer neuromuscular control. This is why MDI is primarily a physical therapy condition — strengthening and neuromuscular retraining address the root cause in a way that surgery cannot replicate reliably.

Posterior Instability

Less common than anterior. Often seen in football linemen, weightlifters (bench press mechanism), and hockey players. May present as posterior labral tear (reverse Bankart). Less well understood, but responds to PT with posterior capsular stretching (tight posterior capsule is a risk factor) and posterior rotator cuff strengthening.

The Evidence: PT vs. Surgery for Instability

The literature on shoulder instability management has matured significantly in the past decade:

MDI: PT First, Always

The FARAGHER study and multiple systematic reviews confirm that structured rehabilitation is the appropriate first-line treatment for MDI — and that it’s highly effective when correctly executed. A well-designed MDI rehabilitation program produces 80–90% good or excellent outcomes at 2-year follow-up. Surgery for MDI (inferior capsular shift) is reserved for patients who fail 6 months of structured PT — and the failure rate with good PT is low.

First-Time Traumatic Dislocation in Young, Active Patients

The FINSTERER RCT and the Arciero study showed that young athletes (especially collision sport athletes under 25) with Bankart lesions have significantly lower recurrence rates with early arthroscopic stabilization vs. conservative treatment (25% vs. 75% redislocation at 2 years). For a 20-year-old competitive contact sport athlete, early surgery is often the right choice.

However, the CANES trial and updated AAOS guidelines emphasize that age, activity level, and sport specificity should drive the decision. A 22-year-old rugby player has a very different risk profile from a 30-year-old recreational tennis player with a first dislocation — and the tennis player may do very well with PT alone.

Recurrent Instability (2+ Dislocations)

After two or more traumatic dislocations, the soft tissue anatomy has accumulated damage that PT alone is less likely to overcome. Recurrent instability is generally a surgical indication, particularly in active patients. PT remains essential for post-surgical rehabilitation.

Over 40 with First Dislocation

Recurrence risk drops significantly after age 40 — and rotator cuff tears (which occur in ~40% of dislocations in patients over 40) become the primary concern. PT focused on rotator cuff rehabilitation is appropriate first-line care. Surgery is less commonly needed.

What Physical Therapy for Shoulder Instability Looks Like

Effective shoulder instability rehabilitation is not generic “shoulder strengthening.” It’s a phased neuromuscular re-education program targeting the specific deficits that allow excessive humeral head translation:

Phase 1: Pain and Inflammation Control (Weeks 1–3)

• Sling use (post-dislocation): typically 1–3 weeks for comfort
• Pendulum exercises to maintain passive range of motion
• Gentle scapular retraction and depression exercises
• Cervical and thoracic mobility (stiffness in adjacent segments drives compensatory shoulder mechanics)
• Pain education and activity modification

Phase 2: Scapular Control and Rotator Cuff Activation (Weeks 3–8)

• Serratus anterior activation: wall push-up plus, sidelying protraction, dynamic hug
• Lower and middle trapezius reactivation (often neurally inhibited after dislocation)
• Rotator cuff isolation in the scapular plane: external rotation, internal rotation, “empty can,” sidelying ER
• Progressive closed-chain loading: wall slides, quadruped weight shifts
• Proprioceptive training in pain-free positions: rhythmic stabilization, joint position sense drills

Phase 3: Dynamic Stabilization (Weeks 8–16)

• Overhead progressive loading: dumbbell press, overhead carries, pull-variations
• Plyometric progressions: wall ball throws, chest passes, overhead medicine ball
• Sport-specific mechanics: throwing progressions for athletes, overhead return for swimmers
• Perturbation training: unstable surface, unexpected load changes that challenge reflexive stabilizer response

Phase 4: Return to Sport / Full Activity (Weeks 16+)

• Criteria-based progression (not time-based) — return when strength and proprioception testing demonstrate readiness
• Full sport simulation under PT supervision before unrestricted return

Post-Surgical Rehabilitation

Bankart repair (arthroscopic labral reattachment) has excellent outcomes — but only with appropriate rehabilitation. The labral repair is structurally strong at 4–6 weeks, but true neuromuscular re-education takes months. Returning to sport too early is the most common cause of failed surgical outcomes.

Post-Bankart rehab at MMPT follows a phased approach aligned with tissue healing constraints:

• Weeks 0–4: Sling protection, passive and assisted range of motion only, pain control
• Weeks 4–12: Progressive active range of motion, scapular stabilization begins, rotator cuff activation in protected positions
• Weeks 12–20: Strengthening progression, closed-chain loading, proprioceptive training
• Weeks 20–32: Dynamic and plyometric training, sport-specific progressions
• 6 months+: Criteria-based return to contact/collision sport

Common Questions

My shoulder popped out once. Do I need surgery?

Not necessarily. The answer depends heavily on your age and activity level. If you’re over 30 and not a contact athlete, supervised PT with a structured return-to-sport protocol has a good success rate. If you’re under 25 and play contact sports, the recurrence risk is high enough that an orthopedic surgeon consultation is warranted — not to commit to surgery, but to get imaging and weigh your options with full information.

What’s the difference between a Bankart lesion and a SLAP tear?

A Bankart lesion is a tear of the anteroinferior labrum — typically from anterior dislocation. A SLAP tear (Superior Labrum Anterior to Posterior) involves the superior labrum where the biceps tendon attaches — typically from repetitive overhead mechanics (throwing athletes) or a fall on an outstretched arm. They can coexist, but they’re different structures with different mechanisms.

I have loose shoulders (“double-jointed”) and they slide out regularly. Is that MDI?

Possibly. Generalized ligamentous laxity + bilateral shoulder instability in multiple directions = classic MDI profile. Physical therapy is the right first treatment — a structured 3–6 month program targeting rotator cuff and periscapular strength and neuromuscular control resolves this for most patients. Surgery has a higher failure rate in MDI than in traumatic unidirectional instability, which is another reason PT comes first.

I had Bankart surgery two years ago and my shoulder still feels unstable. Is that normal?

Not ideal, but not uncommon. The most frequent cause is inadequate rehabilitation — specifically, insufficient neuromuscular training after the structural repair healed. A structured PT program focused on dynamic stabilization and proprioception can often improve post-surgical instability symptoms significantly, even years after the procedure.

Shoulder Instability Treatment in Salt Lake City

Whether you’ve had your first dislocation, are managing recurrent instability, or are recovering from Bankart repair, physical therapy is central to your shoulder’s future stability. The goal isn’t just preventing the next dislocation — it’s building a shoulder that moves well, loads confidently, and keeps pace with your life.

Dr. Emily Warren sees shoulder instability patients one-on-one at Mindful Movement Physical Therapies in Holladay and Salt Lake City. No referral needed in Utah.

📞 Call: (385) 332-4939
📅 Book Your Shoulder Evaluation →

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Dr. Emily Warren, DPT is a McKenzie-certified physical therapist specializing in shoulder, spine, and sports conditions at Mindful Movement Physical Therapies in Holladay, Utah. She has over 14 years of clinical experience treating complex musculoskeletal cases.