Snapping Extensor Pollicis Longus Tendon Secondary to Ganglion Cyst Formation After Trapeziectomy for First Carpometacarpal Arthritis.

There is a wide variety of surgical techniques for first carpometacarpal arthritis described in the literature, but a wide range of complications has also been reported after these operations. We report a case of ganglion cyst formation causing snapping extensor pollicis longus tendon in a patient 3 months after trapeziectomy, ligament reconstruction, and tendon interposition for first carpometacarpal arthritis, which was successfully treated with simple cyst excision under wide-awake local anesthesia without a tourniquet. Adequate clearance of osteophytes and loose bodies, particularly around metacarpal bases, is required to avoid this complication.