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The ulnar collateral ligament (UCL) is a ligament that runs through the inner side of the elbow, connecting one of the forearm bones (ulna) to the upper arm bone (humerus). The UCL supports the elbow in its full range of motion, allowing it to twist and bend with comfort and ease. It also stabilizes the elbow joint during the strenuous motion of an overhead throw.
The overhead throwing motion, particularly when performed repeatedly, is the most common cause behind UCL injuries. This is why UCL-related problems are most common in athletes like baseball pitchers. However, they may occur in any individual who frequently uses the arm in a bending motion or through sudden incidents of trauma.
UCL injuries are typically chronic and occur gradually, over time. Less commonly, the onset of a UCL injury may be sudden, or acute, as can be the case with a fall or during athletic activities like gymnastics or wrestling. Symptoms of a possible UCL problem include:
Diagnosing a UCL injury begins with a physical examination where the doctor will palpate the area to check for signs of ligament injury and test range of motion. One commonly used type of physical examination is the Valgus stress test where pressure is applied to the outside of the elbow to determine if the UCL can prevent the joint from opening up. If a sprain or tear of the ligament is suspected, an imaging test may then be ordered to confirm the diagnosis and identify the severity of damage. Tests commonly used, include:
The severity of a UCL injury is classified according to grades. There are three different grades of injury:
Grade I and II UCL injuries are often successfully treated using non-surgical techniques. Some of these same techniques may also be used to ease Grade III injuries before surgery can be performed.
Tommy John surgery is the colloquial name for UCL reconstruction. This type of surgery is performed in the highest grades of UCL injury. During the procedure, the surgeon reconstructs the torn ligament by using a tendon either from the patient’s own body or from a cadaver. The most commonly used tendon in this surgery is the palmaris longus from the forearm.
Following Tommy John surgery, patients typically recover in mobility-limiting splint or brace for the first few weeks. This will be followed by a rehabilitative period of physical therapy that may last several months.
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