The complications associated with a hematoma block are rare. These include a compartment syndrome, local anesthetic toxicity, and osteomyelitis.19–25 The early signs of local anesthetic toxicity include circumoral and tongue numbness, dizziness, lightheadedness, mental status decline, tinnitus, and visual disturbances. The cardiovascular toxic effects include asystole, atrioventricular blocks, bradycardia, cardiac depression, dysrhythmias, and hypotension. The neurologic toxic effects include agitation, coma, confusion, headaches, seizures, and possibly death. Seizures associated with local anesthetic toxicity are usually short lasting and respond to barbiturates, benzodiazepines, and propofol. Please refer to Chapters 123 and 127 for the complete details regarding local anesthetic complications and toxicity. Introducing bacteria into a previously closed fracture and injury to vascular structures are also potential complications. These can be minimized or eliminated by using strict aseptic technique and carefully identifying the anatomic landmarks.