repeated shoulder dislocation

The shoulder joint resembles a golf ball sitting on a shallow tee, relying on soft tissues for stability. During a traumatic anterior dislocation:
• The fibrocartilaginous labrum and inferior glenohumeral ligament complex tear from the glenoid rim (Bankart lesion).
• The posterosuperior humeral head collides against the anterior glenoid, creating an indentation compression fracture (Hill-Sachs lesion).
Because torn intra-articular capsulolabral tissues rarely heal with physiological tension, the joint capsule remains permanently stretched, leaving the humeral head free to slip out with minimal provocation.

Age at primary dislocation is the single greatest predictor of recurrence:
• Under 20 to 25 Years Old: Experience re-dislocation rates between 70% and 90% due to greater baseline tissue elasticity, elevated sports activity, and vigorous overhead mechanics.
• Over 40 Years Old: Re-dislocation rates fall below 20%, but these patients face high rates of concomitant rotator cuff tendon ruptures and axillary nerve traction injuries during the initial episode.

Neglecting recurrent shoulder instability leads to cumulative joint breakdown:
1. Glenoid Bone Loss: Each episode chips or grinds down the anterior bony glenoid rim, converting what could have been a simple arthroscopic repair into a complex bone-grafting procedure.
2. Instability Arthropathy: Repeated shear stresses erode articular cartilage, accelerating painful post-traumatic osteoarthritis in young adulthood.
3. Loss of Functional Independence: Dislocations progress from high-impact sports collisions to mundane activities like rolling over in bed, reaching into the backseat, or sneezing.

Accurate surgical decision-making requires multi-modal imaging:
• Plain Radiographs: True AP, axillary lateral, and West Point views to screen for rim fractures and Hill-Sachs defects.
• 3D-CT Scan: The gold standard for measuring bone loss; digital humeral head subtraction calculates glenoid defect percentage and assesses whether a Hill-Sachs lesion is ‘on-track’ or ‘off-track’.
• High-Field MRI / MR-Arthrography: Evaluates soft-tissue pathology, including capsular stripping, labral tears (Bankart/ALPSA), and rotator cuff tears.

Physiotherapy alone is rarely sufficient for traumatic anterior dislocations in active individuals:
• When PT Works: Effective in non-traumatic, multidirectional instability (MDI) caused by generalized ligamentous hyperlaxity, where periscapular and rotator cuff strengthening can dynamically compensate for capsular slack.
• When PT Fails: In structural, traumatic Bankart tears, torn fibrocartilage cannot biologically reattach through exercise. Without surgical repair, muscular compensation frequently breaks down during athletic deceleration or rotational arm movements.

Arthroscopic Bankart repair is the preferred treatment when instability is primarily soft-tissue driven, defined by:
• Subcritical glenoid bone loss (less than 13% to 15%).
• An ‘on-track’ Hill-Sachs lesion that does not engage the glenoid rim during abduction and external rotation.
• Non-collision, recreational, or occupational activity levels.
Through 3 small puncture incisions, the surgeon re-anchors the torn labrum and tensions the anterior capsule back to the bone using bio-composite or PEEK suture anchors with minimal disruption to the subscapularis muscle.

Attempting soft-tissue arthroscopy in the presence of substantial bone loss yields failure rates exceeding 40% to 50%. The Latarjet procedure is mandatory in:
• Glenoid bone loss exceeding 13% to 15%.
• An engaging, ‘off-track’ Hill-Sachs lesion.
• Revision surgery after a failed previous Bankart repair.
• Young collision or contact athletes (rugby, wrestling, martial arts).
It transfers the coracoid process with its attached conjoint tendon to the anterior glenoid rim, creating a robust bony extension and a dynamic muscular sling that permanently prevents dislocation.

Critical errors during acute dislocations include:
1. Aggressive On-Field Reductions: Pulling the arm forcefully without muscle relaxants or medical training can fracture the humeral head, tear the subscapularis tendon, or permanently damage the axillary nerve.
2. Skipping Radiographs: Reductions should always be preceded and followed by X-rays to rule out concomitant fractures.
3. Discarding the Sling Prematurely: Removing immobilization too early compromises primary scar-tissue formation, drastically increasing the likelihood of recurrent episodes.

When surgical technique matches the anatomical pathology:
• Arthroscopic Bankart Repair: Achieves a 90% to 92% success rate in properly selected patients with robust bone stock and good compliance with rehabilitation.
• Latarjet Procedure: Considered the gold standard for high-risk shoulders, achieving 95% to 98% long-term joint stability with re-dislocation rates under 2% to 4%, even in elite collision athletes.

Phased rehabilitation progresses through structured milestones:
• Weeks 1–4: Sling immobilization to protect the repaired labrum or bone graft; only gentle wrist, hand, and elbow exercises are permitted.
• Weeks 5–8: Discontinue sling; initiate active-assisted range-of-motion exercises, avoiding aggressive external rotation in abduction.
• Weeks 9–12: Progressive rotator cuff, deltoid, and periscapular strengthening with resistance bands.
• Months 4–6: Return to full overhead and collision sports once objective criteria are met: 100% radiographic bone fusion (for Latarjet), absence of apprehension on exam, and ≥ 90% strength symmetry compared to the healthy shoulder.