The Ulnar Tunnel Triad test is a wrist examination procedure to diagnose ulnar nerve compression. The test identifies three signs of Ulnar Tunnel syndrome: tenderness over the ulnar tunnel, clawing of the ring finger and hypothenar muscle atrophy. All these should be present to confirm ulnar nerve syndrome.
The ulnar nerve travels through the tunnel of Gyron and innervates the muscles of the ring finger and the little finger. Compression of the nerve elicits all three responses.
The patient must be awake and cooperative during an Ulnar Tunnel Triad test.
- Patient should be seated during the procedure.
- The examiner observes the wrist of the afflicted hand and uses his hands to palpate the wrist for tenderness over the ulnar tunnel, clawing of the ring finger and hypothenar muscle atrophy.
Positive Ulnar Tunnel Triad test
The presence of all three signs indicates ulnar nerve compression at the tunnel of Gyron or the ulnar tunnel.
Review ulnar nerve in neurologic exam chapter.