Endoscopic cubital tunnel surgery, also known as endoscopic ulnar nerve release (EUNR), is a minimally invasive surgical procedure used to treat cubital tunnel syndrome (CuTS). CuTS is a condition caused by compression or irritation of the ulnar nerve as it passes through the cubital tunnel, located on the inner side of the elbow. This can result in symptoms such as pain, numbness, tingling, and weakness in the hand and fingers, particularly in the ring and little fingers.

During endoscopic cubital tunnel surgery, the surgeon makes one or two small incisions near the elbow and inserts an endoscope, a thin, flexible tube with a camera and light attached to it. The endoscope allows the surgeon to visualize the structures inside the cubital tunnel, including the tissues that may be compressing or irritating the ulnar nerve.

Using specialized surgical instruments inserted through the endoscope and another small incision, the surgeon then releases or decompresses the structures causing pressure on the ulnar nerve. This may involve cutting ligaments, removing bone spurs, or releasing tight muscles to create more space for the nerve to move freely without compression.