What is the appropriate assessment and management for an acute shoulder dislocation?

Acute Shoulder Dislocation: Assessment and Management

For acute shoulder dislocation, obtain plain radiographs first, reduce the shoulder promptly using a biomechanical technique (FARES method preferred for pain control) with intra-articular anesthesia rather than IV sedation, confirm reduction with repeat imaging, immobilize for 1 week, and refer patients under 40 years old or contact athletes to orthopedics for surgical stabilization discussion to prevent recurrent instability. 1, 2, 3

Initial Diagnostic Approach

Radiography is the mandatory first imaging study for any acute shoulder pain including suspected dislocation 1. Point-of-care ultrasound (POCUS) demonstrates diagnostic accuracy comparable to radiography and can expedite diagnosis in the emergency setting 3.

After confirming dislocation on imaging, assess for:

• Associated fractures (proximal humerus, glenoid rim, Hill-Sachs lesions)
• Patient age and activity level
• Mechanism of injury
• Neurovascular status, particularly axillary nerve function (most commonly injured) 3

Reduction Technique

Reduce the shoulder promptly after diagnostic imaging 2. The choice of reduction technique should prioritize biomechanical approaches:

• FARES method is superior for pain management compared to other techniques, though success rates are equivalent across methods 3
• Initial attempts should be performed without analgesics using gentle biomechanical techniques 2
• If initial reduction fails, use intra-articular anesthesia (IAA) rather than IV sedation - IAA is equally effective with fewer adverse events and shorter ED stays 3
• Procedural sedation and analgesia are reserved for failed reduction attempts 2

Critical pitfall: Always obtain post-reduction imaging to confirm successful reduction and rule out iatrogenic complications 2.

Post-Reduction Imaging Strategy

After reduction, the imaging pathway depends on clinical findings:

• If dislocation confirmed on initial films: MRI without IV contrast is the next appropriate study to assess labral tears, rotator cuff injury, and bone loss 1
• If concern for occult fracture: CT without contrast provides superior osseous detail 1
• MR arthrography is unnecessary acutely because post-traumatic hemarthrosis provides natural joint distention for soft tissue visualization 1

Immobilization Protocol

Immobilize for 1 week only in relative immobilization 2. Recent evidence favors external rotation immobilization over internal rotation for preventing redislocation 3, though this remains somewhat controversial. The brief immobilization period (1 week) represents a shift from historical practices of 3-6 weeks.

Rehabilitation Pathway

Following the acute phase, initiate a structured 5-phase protocol 4:

1. Acute protection (0-3 weeks): Education, sling weaning, gentle range of motion
2. Movement and early strengthening (3-6 weeks): Progressive active motion, initiate resistance exercises
3. Progressive strengthening (6-12 weeks): Through-range resisted exercises, proprioception training
4. Return to sport (>12 weeks): Criteria-based progression
5. High-level function: Sport-specific training

Physical therapy must target early restoration of function, coordination, and proprioception rather than prolonged immobilization 2.

Surgical Referral Criteria

Refer to orthopedics for surgical stabilization discussion if 2, 3, 5:

• Age < 40 years (strongest predictor of recurrence)
• Male sex (additional risk factor)
• Contact or overhead sport athletes
• Significant bone loss (>20-25% glenoid or large Hill-Sachs lesion)
• Associated displaced fractures requiring fixation

Surgical Bankart repair consistently demonstrates reduced redislocation rates compared to non-operative management, particularly in young patients 3. The recurrence rate after non-operative treatment in young patients can exceed 80%, and delayed surgery often requires more complex open or bony procedures due to progressive structural damage 6.

Evidence Strength Considerations

The 2025 ACR Appropriateness Criteria 1 and 2026 multidisciplinary guideline 2 provide the strongest framework. However, both acknowledge that most recommendations are based on low GRADE evidence supplemented with expert opinion 2. The 2025 umbrella review 3 synthesizes multiple meta-analyses showing:

• POCUS has high diagnostic accuracy
• IAA equals IV sedation effectiveness with better safety profile
• No reduction technique is clearly superior for success rates, but FARES excels for pain control
• External rotation immobilization reduces recurrence versus internal rotation
• Early surgical stabilization prevents recurrence better than conservative management in high-risk patients

The key clinical decision point is identifying high-risk patients who benefit from primary surgical stabilization rather than accepting the 50-80% recurrence rate with conservative management alone.