Ulnar Collateral Ligament Injury
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Ligaments are strong bands of tissue that hold bones together. In the elbow joint, the ulnar collateral ligament, or UCL, holds the ulna (e.g., lower arm bone) to the humerus (e.g., upper arm bone). When the ulnar collateral ligament gets torn due to injury, the elbow can become unstable.
The ulnar collateral ligament may become stretched or even torn due to a single traumatic episode—or more commonly, repetitive stress, such as throwing a baseball.