Dynamic Shifts of the Deep Ulnar Nerve Branch with Wrist Movement

Abstract

This study on cadavers looks at how the deep branch of the ulnar nerve moves in the distal ulnar compartment near the hook of the hamate. It also investigates whether there is a risk of nerve compressing during different wrist movements. Researchers dissected 30 hands preserved in formalin (15 right and 15 left) from 22 male and 8 female cadavers. When the wrist was in a neutral position, they found the deep branch of the ulnar nerve 2.9 mm from the ulnar side of the hook of the hamate. This distance decreased to 2.3 mm when the wrist flexed and 1.9 mm when it ulnarly deviated. On the flip side when the wrist extended or radially deviated, the nerve shifted making the distance a slang bigger. These shifts may increase the likelihood of ulnar nerve compression in individuals who frequently flex their wrists or move them toward the ulnar side. Knowing about these anatomical relationships is key for doctors and surgeons to improve their surgical techniques to lower the risk of hurting the nerve and better treat ulnar tunnel syndrome.