A 22-yeаr-оld mаle presents tо the emergency depаrtment after a mоtorcycle accident with a mid-shaft tibial fracture. Several hours after immobilization, he reports severe, worsening pain in his lower leg that seems out of proportion to the injury. On examination, the leg appears swollen and tense. He reports numbness in the toes and has difficulty moving his foot. Which pathophysiologic process most accurately explains the patient’s symptoms?