Pathology
Ulnar Tunnel Syndrome is the compression of the ulnar nerve at the level of the wrist. Similar to the median nerve, this nerve can be compressed at more proximal locations and can occur in combination with other nerves. It is the job of the hand specialist to identify and differentiate the location and severity of the compression. During the ulnar nerve’s path to the hand, it is accompanied by the ulnar artery and together they crossa fibro-osseous tunnel named, Guyon’s canal. It is in this location that the nerve may be entrapped. Ulnar Tunnel Syndrome is much less frequent than carpal tunnel and cubital tunnel syndrome. Unlike carpal tunnel syndrome, the ulnar tunnel syndrome is frequently caused by an occupying mass or trauma including a ganglion cyst, lipoma, ulnar artery thrombosis, aneurysm, hook of the hamate fracture or distal radius fracture. Patients can complain of pain, numbness and tingling of the pinky and ring fingers, loss of dexterity, weakness, clawing position of the ring and small fingers while attempting a straighten the fingers and signs of decreased or absent blood supply to the same digits. A careful history and physical exam should provide the correct diagnosis. Confirmation of the diagnosis can be done with electro diagnostic studies.
Treatment
Non-operative treatment has minimal role in this condition. Once the diagnosis is confirmed, surgical exploration and treatment is necessary according to the causative factor. Details of the surgical plan are explained at the ROC by your surgeon with contingency plans included depending on what is discovered during surgery.