What is the recommended immediate management of an acute hip dislocation?

Immediate Management of Acute Hip Dislocation

Perform urgent closed reduction within 6 hours of injury under procedural sedation in the emergency department to minimize the risk of avascular necrosis of the femoral head. 1, 2, 3

Pre-Reduction Assessment

• Obtain AP pelvis and lateral hip radiographs immediately to confirm the dislocation direction (posterior in >90% of cases vs. anterior) and identify associated acetabular fractures before attempting reduction 4
• Perform a focused neurovascular examination documenting sciatic nerve function (particularly with posterior dislocations) and distal pulses, as nerve injury occurs in up to 10-20% of cases 3, 4
• Assess for ipsilateral knee injuries, as hip dislocation significantly increases the risk of concomitant knee ligament injuries (particularly PCL tears) by 7-fold, which are frequently missed in the acute setting 5

Reduction Technique Selection

• Use the Captain Morgan technique as a primary reduction method, which achieves 92% success rate with the physician placing their knee behind the patient's flexed knee and lifting with anterior force while applying rotation as needed 6
• For posterior dislocations (most common), apply longitudinal traction with internal rotation; for anterior dislocations, use inline traction with external rotation 4
• Perform reduction under adequate procedural sedation with muscle relaxation to facilitate success and minimize patient discomfort 2, 3
• If initial closed reduction fails (occurs in 10-13% of cases), attempt alternative techniques before proceeding to operative reduction, as delays significantly worsen outcomes 1, 2

Post-Reduction Protocol

• Obtain pelvic radiographs immediately after reduction to confirm concentric reduction and detect intra-articular fragments or associated fractures 7
• Order non-contrast CT scan of the hip if posterior acetabular wall fractures are visible on radiographs, if closed reduction failed, or if post-reduction films show joint incongruity, as CT has 87.3% sensitivity for detecting intra-articular fragments 7
• Initiate relative rest for 3-9 days with multimodal analgesia, considering nerve blocks to facilitate early mobilization 7
• Begin early mobilization with partial weight-bearing at an average of 9 days, progressing to full weight-bearing at 3 months, as this reduces complications from prolonged immobility without increasing early complications 7

Contraindications to Early Mobilization

• Unstable acetabular fractures requiring surgical fixation 7
• Non-concentric reduction on post-reduction imaging 7
• Large intra-articular fragments preventing stable reduction 7

Movement Precautions

• Instruct patients to avoid excessive hip flexion and internal rotation to prevent redislocation 7

Critical Pitfalls to Avoid

• Delaying reduction beyond 6 hours dramatically increases the risk of avascular necrosis and poor long-term outcomes, as time to reduction is the primary driver of both short and long-term function 1, 3
• Missing ipsilateral knee injuries (present in 26% of hip dislocation-fractures) leads to secondary meniscal and chondral damage; maintain high suspicion and examine the knee systematically 5
• Failing to obtain post-reduction CT when indicated results in missed intra-articular fragments that compromise stability and outcomes 7
• Using routine contrast-enhanced imaging (CT or MRI) for post-reduction follow-up adds cost and risk without diagnostic benefit 7