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Difficulty: MediumOrthopedic Surgery

A 35-year-old woman is brought to the emergency department after a high-velocity motor vehicle collision. Her primary trauma survey is intact, and she is hemodynamically stable. She complains of severe right hip pain. On physical examination, her right lower extremity is shortened, internally rotated, and adducted. Arrange the following steps in the optimal chronological order for the acute orthopedic management of this patient's condition.

  1. 1Perform a comprehensive baseline neurovascular examination of the affected extremity
  2. 2Obtain anteroposterior (AP) pelvis and specific hip radiographs
  3. 3Perform urgent closed reduction of the hip joint under procedural sedation
  4. 4Re-evaluate and document the post-reduction neurovascular status
  5. 5Obtain a post-reduction computed tomography (CT) scan of the pelvis and hip

Answer

The correct sequence prioritizes patient safety and joint preservation: 1) Initial neurovascular exam to establish a baseline, particularly for sciatic nerve function. 2) Plain radiographs to confirm the dislocation and rule out contraindicating fractures. 3) Urgent closed reduction to prevent avascular necrosis. 4) Post-reduction neurovascular exam to ensure no iatrogenic injury. 5) Post-reduction CT scan to confirm concentric reduction and assess for intra-articular fragments.
The management of a posterior hip dislocation follows a strict, time-sensitive protocol to prevent catastrophic complications such as avascular necrosis (AVN) and unrecognized nerve injury. Establishing a baseline neurovascular exam is the critical first step because the sciatic nerve is frequently injured in these trauma patterns. Plain radiographs are then required to confirm the diagnosis and rule out an associated femoral neck fracture, which could be catastrophically displaced during reduction. Once the bony anatomy is cleared, urgent closed reduction must occur within 6 hours to alleviate vessel tension and reduce the risk of AVN. After the hip is successfully reduced, a repeat neurovascular exam is required to ensure no iatrogenic injury occurred during the pull. Finally, a post-reduction CT scan is mandated to verify that the reduction is truly concentric and to identify any loose bodies or subtle acetabular fractures that were masked on plain films.

Step-by-Step Solution

1
Perform initial neurovascular assessment
Establishes a baseline nerve and vascular status
Posterior hip dislocations are highly associated with sciatic nerve injury (up to 20%); documenting baseline status is critical prior to any manipulation.
2
Obtain plain radiography
Confirms posterior dislocation and visualizes gross bony architecture
Distinguishes between simple dislocations and fracture-dislocations (e.g., displaced femoral neck fractures), which might strictly contraindicate closed reduction.
3
Perform closed reduction
Relocates the femoral head back into the acetabulum
Must be performed urgently (ideally within 6 hours) to reduce capsular tension and restore blood flow, significantly decreasing the risk of avascular necrosis (osteonecrosis).
4
Perform post-reduction neurovascular exam
Verifies nerve and vessel integrity after manipulation
Reduction maneuvers can stretch or compress the sciatic nerve or vessels; immediate post-procedure assessment is mandatory to detect iatrogenic injury.
5
Obtain post-reduction CT scan
Evaluates reduction quality and provides fine bone detail
Plain films may miss small, incarcerated osteochondral fragments or subtle acetabular wall fractures that block concentric reduction and necessitate surgical intervention.

Key Concept

Acute chronological management sequence of traumatic posterior hip dislocation
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Topics

Orthopedic Surgery

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