What are the recommended techniques for assessing and reducing common joint dislocations, including appropriate analgesia, sedation, and post‑reduction care?

Joint Dislocation Reduction: Evidence-Based Techniques and Management

Pre-Reduction Assessment and Imaging

Always obtain standard radiographs before attempting reduction, including anteroposterior (AP) views in internal and external rotation, plus an axillary or scapular Y view to confirm dislocation type and identify associated fractures. 1

• The axillary or Y view is critical because over 60% of posterior dislocations are missed on AP views alone, and attempting reduction on an unrecognized posterior dislocation can worsen the injury. 1
• Specifically evaluate for Hill-Sachs deformity, bony Bankart lesion, and proximal humerus fractures before proceeding. 1
• Document baseline neurovascular status, particularly axillary nerve function, before any reduction attempt. 2

Procedural Sedation and Analgesia

For shoulder dislocations requiring sedation, use etomidate as the first-line agent (0.1-0.2 mg/kg IV), which provides effective sedation with a median procedural time of 10 minutes and 90% success rate. 3, 1

Sedation Options by Efficacy:

• Etomidate: Shortest procedural time (10 minutes median), but causes myoclonus in approximately 21% of patients, which is generally benign. 3
• Propofol: Alternative agent (1 mg/kg initial dose, then 0.5 mg/kg supplements) with faster recovery time (approximately 15 minutes vs 76 minutes for midazolam), though may cause transient hypotension and injection pain. 3
• Ketamine/midazolam combination: More efficacious than fentanyl/midazolam for orthopedic procedures with fewer respiratory complications (0.5 mg/kg ketamine up to 2 mg/kg plus 0.1 mg/kg midazolam). 3

Critical Safety Considerations:

• When combining benzodiazepines and opioids, administer the opioid first, then titrate the benzodiazepine, as combined use increases respiratory depression risk significantly (hypoxemia in 25% of patients, apnea in 50%). 3
• Have reversal agents immediately available: naloxone for opioids and flumazenil for benzodiazepines. 3
• Emergency physicians performing procedural sedation must be trained in rescue airway interventions and cardiovascular support. 4

Non-Pharmacologic Adjuncts:

• Use distraction and visual imagery techniques to reduce patient fear and anxiety before pharmacologic sedation. 4
• Minimize physical restraints by optimizing pain and anxiety control pharmacologically. 4

Reduction Techniques by Joint

Shoulder (Anterior Dislocation):

• Multiple reduction techniques exist with individual success rates ranging from 60-90% for first-time dislocations. 5
• Emergency physicians should be familiar with several different techniques in case initial attempts fail. 6
• The lateral position maneuver (Makihara method) can be performed by a single physician without sedation in select cases. 5
• Most sports-related shoulder dislocations can be safely reduced on-field when properly evaluated and diagnosed. 7

Hip Dislocation:

• Hip dislocations require urgent reduction to minimize risk of avascular necrosis. 6
• Over 90% of hip dislocations can be successfully reduced in the emergency department, with individual technique success rates of 60-90%. 6
• Familiarity with multiple reduction techniques is essential as patient characteristics may limit use of certain maneuvers. 6
• Be aware that hip dislocation-fractures significantly increase risk of ipsilateral knee injury (OR 7.25), particularly posterior cruciate ligament injury. 8

Knee Dislocation:

• Knee dislocations carry high risk of vascular, neurological, and multi-ligamentous injuries requiring multidisciplinary specialist care. 9
• Not all knee dislocations are visible on plain radiographs; maintain high clinical suspicion based on examination findings. 9

Patellofemoral and Interphalangeal Joints:

• These are among the most common athletic joint dislocations and can often be managed with closed reduction techniques when the clinician is properly trained. 10
• Athletic trainers and emergency physicians should be formally trained and skilled in performing various reduction techniques for these joints. 10

Post-Reduction Management

Mandatory Imaging:

Obtain post-reduction radiographs (AP and axillary or Y views) to confirm successful reduction and identify any fractures obscured by the dislocation. 1, 2

Neurovascular Re-Assessment:

• Repeat and document neurovascular examination immediately after reduction, particularly axillary nerve function. 1, 2
• Consider CT angiography if vascular compromise is suspected, especially with associated proximal humeral fractures. 2

Immobilization:

• Immobilize shoulder dislocations in an internal rotation sling. 1
• Brief immobilization period of 1-2 weeks is recommended before beginning rehabilitation. 1, 2

Pain Management Protocol:

• First-line: Acetaminophen or ibuprofen if no contraindications exist. 1, 2
• Alternative: Intra-articular corticosteroid injection provides significant pain reduction. 1, 2
• Avoid: Prolonged opioid use. 1

Advanced Imaging for Risk Stratification:

• Patients <35 years: Obtain MRI without contrast or MR arthrography within 1-2 weeks to evaluate for labral tears, capsular injuries, and bone loss that predict recurrence. 1, 2
• Patients >40 years: Consider MRI to evaluate for rotator cuff tears, which are commonly associated with dislocation in this age group. 1, 2

Rehabilitation Protocol

Begin early physical therapy after the brief immobilization period (1-2 weeks), focusing on gentle mobilization and progressive strengthening. 1, 2

• Focus on gentle stretching and mobilization, especially increasing external rotation and abduction. 2
• Avoid overhead pulleys during initial recovery as they encourage uncontrolled abduction that may worsen the injury. 1, 2

Critical Pitfalls to Avoid

• Never rely on AP views alone for shoulder dislocations—always obtain axillary or scapular Y views to avoid missing posterior dislocations. 1, 2
• Do not delay reduction attempts, as delays increase neurovascular complications. 2
• Never overlook associated rotator cuff tears, especially in patients over 40 years or with high-energy trauma mechanisms. 2
• Do not miss ipsilateral knee injuries in patients with hip dislocation-fractures; perform systematic knee evaluation including MRI when feasible. 8
• Avoid attempting reduction on unrecognized posterior dislocations or fracture-dislocations, as this can worsen the injury. 1

Discharge Criteria

• Discharge from the emergency department may be safe approximately 30 minutes after final medication administration in patients without serious adverse effects during procedural sedation. 3
• Ensure proper documentation of pre- and post-reduction neurovascular status and radiographic confirmation of successful reduction. 11