Ulnar Collateral Ligament Injury | Elbow

Like other joints, the elbow is held together by strong bands of tissue called ligaments. On the elbow’s inner side is the ulnar collateral ligament complex, called the UCL. It’s made of three bands that connect the upper arm bone (humerus) to the lower arm’s ulna. The UCL is the elbow ligament most often injured by baseball pitchers and by other athletes who play throwing sports.