A 38-year-old male presents to the emergency department with acute onset severe pain in the left buttock and posterior thigh following a fall onto the ischial tuberosity while playing cricket. On examination, he has weakness of knee flexion and ankle plantarflexion, with sensory loss over the lateral leg and sole of the foot. Imaging confirms a fracture-dislocation of the hip with posterior displacement. What is the most appropriate immediate next step in management?

Explanation

## Clinical Context This patient has a posterior hip dislocation with sciatic nerve compression/injury. The combination of motor deficits (knee flexion and ankle plantarflexion weakness) and sensory loss in the sciatic nerve distribution confirms sciatic nerve involvement. ## Mechanism of Injury Posterior hip dislocations commonly compress or stretch the sciatic nerve as it passes posterior to the hip joint. The nerve is at risk of: - Direct compression by the dislocated femoral head - Traction injury during the dislocation - Ischemic injury from prolonged compression ## Why Immediate Reduction is Critical **Key Point:** Sciatic nerve injury in hip dislocation is a **time-dependent complication**. Prolonged compression (>6 hours) significantly increases the risk of permanent neurological damage and poor functional recovery. **High-Yield:** The window for optimal neurological recovery is within the first 6–12 hours. Immediate closed reduction under general anesthesia: 1. Relieves mechanical compression on the sciatic nerve 2. Restores blood supply to compressed nerve segments 3. Prevents progression from neurapraxia to axonotmesis 4. Maximizes potential for spontaneous nerve recovery ## Management Algorithm ```mermaid flowchart TD A[Posterior hip dislocation with sciatic nerve signs]:::outcome --> B{Time since injury?}:::decision B -->|< 6 hours| C[Immediate closed reduction under GA]:::action B -->|6-12 hours| C C --> D[Post-reduction imaging to confirm reduction]:::action D --> E[Assess residual neurological deficit]:::action E --> F{Complete vs incomplete injury?}:::decision F -->|Incomplete| G[Serial neuro exams + EMG at 3-4 weeks]:::action F -->|Complete| H[MRI/EMG at 3-4 weeks to assess nerve continuity]:::action H --> I{Nerve continuity intact?}:::decision I -->|Yes| J[Expectant management with physiotherapy]:::action I -->|No| K[Consider surgical exploration]:::urgent ``` **Clinical Pearl:** Sciatic nerve injury occurs in 6–12% of posterior hip dislocations. Early reduction significantly improves neurological outcomes compared to delayed reduction.