How To Apply an Ulnar Gutter Splint By Miranda Lewis, MD, University of Washington Reviewed / Revised Jul 2021 | Modified Sep 2022 View Patient Education Indications Contraindications Complications Equipment Positioning Step-by-Step Description of Procedure Aftercare Warnings and Common Errors Tips and Tricks Topic Resources How To Apply an Ulnar Gutter... Ulnar gutter splints are devices applied to immobilize fractures of the 4th and 5th metacarpal.