A 28-year-old male presents to the emergency department 6 hours after a crush injury to his left leg sustained in a motorcycle accident. He complains of severe pain in the anterior compartment of the leg that is disproportionate to the clinical findings. On examination, the leg is swollen and tense. Pain is elicited on passive dorsiflexion of the foot. Sensation over the dorsum of the foot is intact. Pedal pulses are palpable bilaterally. What is the most appropriate next step in management?