Emergency Department Management of Prosthetic Shoulder Dislocation
Immediately consult orthopedic surgery for urgent closed reduction under procedural sedation, and if unsuccessful, proceed to open reduction in the operating room 1.
Initial ED Actions
Immediate Assessment
- Perform neurovascular examination focusing on axillary nerve function (deltoid sensation and motor function) and radial nerve status, as nerve injuries are common with shoulder dislocations 2
- Assess for associated periprosthetic fracture on the existing X-ray, as humeral fractures are more common than glenoid fractures in this setting 3
- Document mechanism of injury and time since dislocation
Pain Management
Administer procedural sedation and analgesia for reduction attempt. Intra-articular anesthesia is equally effective as intravenous sedation with fewer adverse events in native shoulder dislocations 2, though prosthetic dislocations typically require deeper sedation given the complexity.
Reduction Approach
Critical Distinction from Native Dislocations
Prosthetic shoulder dislocations are fundamentally different from native shoulder dislocations. The available evidence on reduction techniques (FARES method, various closed reduction maneuvers) applies to native shoulders 2. Prosthetic dislocations require orthopedic consultation before reduction attempts 1.
Reduction Protocol
- Do not attempt reduction without orthopedic involvement - prosthetic components may have associated loosening, component malposition, or soft tissue deficiency that contributed to the dislocation 3, 1
- Orthopedic surgeon should perform closed reduction under adequate sedation
- If closed reduction fails, proceed to open reduction in OR 1
Post-Reduction Management
Confirm Adequate Reduction
Obtain orthogonal post-reduction radiographs (anteroposterior and axillary or scapular Y views) to confirm concentric reduction and exclude complications 4. Studies show only 22.7% of patients receive adequate orthogonal views post-reduction, representing a significant quality gap 4.
Assess for Underlying Causes
Prosthetic dislocation indicates potential:
- Component malposition or loosening 3, 1
- Soft tissue deficiency (rotator cuff insufficiency) 3
- Inadequate soft tissue tensioning at time of original surgery 1
Immobilization
Immobilize in sling for approximately 1 week following reduction 5. The specific position (internal vs external rotation) is less critical in prosthetic dislocations than in native dislocations.
Common Pitfalls
Major pitfall: Treating prosthetic dislocation like a native shoulder dislocation. Prosthetic dislocations have a significantly higher risk of recurrent instability - patients with prior shoulder instability who undergo TSA have 96.5% one-year dislocation-free survivorship, meaning 3.5% will redislocate 6. This is substantially higher than native shoulders.
Imaging pitfall: Failing to obtain adequate orthogonal views post-reduction occurs in 77% of cases, and inadequacy is recognized by ED physicians in only 11.8% of cases 4. Ensure both AP and axillary/scapular Y views are obtained.
Disposition pitfall: These patients require urgent orthopedic follow-up within days, not weeks. The underlying cause of dislocation (component loosening, malposition, soft tissue deficiency) must be addressed to prevent recurrence 1.
Disposition
- Admit if reduction unsuccessful or if associated periprosthetic fracture identified
- If successfully reduced: discharge with orthopedic follow-up within 3-5 days
- Patients with surgical complications or prior ED visits have significantly higher readmission rates (OR 13.92) 7
- Document neurovascular status pre- and post-reduction
- Counsel patient on high risk of recurrence and need for definitive orthopedic management 6, 1