How To Do a Radial Nerve Block By Richard Pescatore, DO, Delaware Division of Public Health Reviewed / Revised Oct 2021 | Modified Sep 2022 View Patient Education Indications Contraindications Complications Equipment Additional Considerations Relevant Anatomy Positioning Step-by-Step Description of Procedure Aftercare Warnings and Common Errors Tricks and Tips Topic Resources How To Do a Radial Nerve Block A radial nerve block anesthetizes the dorsum of the thenar half of the hand (from the thumb through the radial half of the ring finger), excluding the fingertips.