The ultrasound probe will be used for real-time needle and hematoma localization using the linear probe. The hematoma block will then be performed with aseptic technique. The skin will be prepped with chlorhexidine. A 20-gauge needle will be inserted in-plane into the hematoma site. A small amount of blood will be aspirated to confirm placement and 5-10 mL of 1% lidocaine will be infiltrated.

The ultrasound probe will be in place on the patient's arm to maintain single blinding of the study. The ultrasound machine will not be used for needle and hematoma localization. The hematoma block will then be performed with aseptic technique. The skin will be prepped with chlorhexidine. A 20-gauge needle will be inserted in-plane into the hematoma site. A small amount of blood will be aspirated to confirm placement and 5-10 mL of 1% lidocaine will be infiltrated.

The ultrasound will be used to assist with the delivery of a hematoma block in patients with distal forearm fractures.

Pain will be measured using a ten point Likert scale with zero designated as no pain and ten being the worst pain the patient can imagine. The higher score the worse the outcome.