Surgical anatomy of the dorsal cutaneous branch of the ulnar nerve and its clinical significance in surgery at the ulnar side of the wrist

Abstract

The dorsal cutaneous branch of the ulnar nerve can be easily injured during surgery at the ulnar side of the wrist. We sought to identify the surgical anatomy, the pathway around the ulnar styloid process and the safe zone of the dorsal cutaneous branch of the ulnar nerve. In 44 forearm dissections, we found that the dorsal cutaneous branch of the ulnar nerve originated at a median distance of 6.8 cm proximal to the tip of the ulnar styloid. We classified the crossing pattern of the dorsal cutaneous branch of the ulnar nerve at a vertical axis into three types. The most common type featured the dorsal cutaneous branch of the ulnar nerve crossing the vertical axis at a median distance of 10.0 mm distal to the tip of the ulnar styloid. In 14% of specimens, the dorsal cutaneous branch of the ulnar nerve crossed the vertical axis at the level of the tip of the ulnar styloid. By mapping the course of the nerve using a Cartesian coordinate system, it was found that the areas located proximal and palmar to the tip of the ulnar styloid had a very high density of dorsal cutaneous branches of the ulnar nerve. We were unable to establish a safe zone. We recommend identifying the dorsal cutaneous branch of the ulnar nerve in every patient undergoing surgery at the ulnar side of the wrist.

Do “Anatomic” Distal Ulna Plating Systems Fit the Distal Ulna Without Causing Soft Tissue Impingement?

“…Type 1 (9%) crossed the vertical axis proximal and Type 3 (14%) crossed at the styloid. 6 These findings are similar to others who have examined the DBUN. 7,8 Our study found similar trajectories of the DBUN with only 1 (8%) Type 1 nerve, 8 (67%) Type 2 nerves, and 3 (25%) Type 3 nerves.…”

Surgical Exposures of the Distal Radius for Fracture Fixation

“…Finally, the palmar cutaneous branch of the median nerve originates from the radial aspect of the median nerve at a level ranging from 3.2-8.4 cm proximal to the wrist crease. 7,8 It then travels between the palmaris longus (PL) and flexor carpi radialis (FCR) tendons before progressing superficially to provide sensation to the volar wrist and palm.…”

Internervous surgical approaches in dorsal and radial aspects of the hand and wrist

“…The dorsal sensory branch of the ulnar nerve runs posterior to the flexor carpi ulnaris tendon to reach the ulnar aspect of the wrist, where it runs close to the ulnar styloid (Uerpairojkit et al, 2019). It passes over the bases of the 4th and 5th metacarpals and branches over the dorsum of the hand to supply sensation to the ring and little finger.…”