Sports and other activities that involve throwing (or similar arm movement) can sometimes lead to problems affecting the UCL, or ulnar collateral ligament. This ligament can be inflamed or torn, which causes pain on the inside elbow. An operation commonly known as Tommy John surgery can be performed to reconstruct the UCL using a tissue graft, upon which the ligament can regrow. In many cases, the tendon belonging to the patient can be used. If inflammation of the nerve is the primary concern rather than a ligament tear, the nerve can be repositioned in front of the elbow to reduce friction and stretching.