Abstract
Ulnar bursa of the hand invaginates the flexor digitorum superficialis and flexor digitorum profundus tendons of the little, ring, long, and index fingers. Distension of this bursa can have an inflammatory or infective cause. It can also originate from pathology of another site (e.g., degenerative wrist joint). Because of the tough overlying palmar aponeurosis, distended ulnar bursa can have swelling at a remote site. The distended ulnar bursa can also have compressive neuropathy to the ulnar nerve and median nerve. The purpose of this Technical Note is to describe the technical details of the 2 ulnar portals technique involving endoscopic resection of the ulnar bursa. This is indicated for symptomatic distension of the ulnar bursa, especially with hypothenar extension.