An ulnar collateral ligament (UCL) injury is an inner elbow injury. It’s most commonly an overuse injury and most famously known for being a baseball pitcher’s injury. If you have a UCL injury you will feel pain and tenderness at your elbow. Treatments include rest, ice, medications and physical therapy. Tommy John Surgery uses a tendon as a replacement for the UCL.
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Your ulnar collateral ligament (UCL) is a strong band of tissue on the inner side of your elbow. It keeps your elbow joint stable during the act of throwing or overhead arm movements.
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Cleveland Clinic is a non-profit academic medical center. Advertising on our site helps support our mission. We do not endorse non-Cleveland Clinic products or services. Policy
Stress on your UCL from repetitive overhead movement or a fall on your outstretched arm can irritate and inflame, stretch, partially tear or completely tear your UCL. Ligament damage leads to pain, looseness in your elbow joint and loss of function.
The UCL is the most common ligament injured from repetitive overhand throwing. It’s probably best known as the ligament most often injured in baseball pitchers.
Your elbow joint is where the ends of three bones meet — your two lower arm bones (ulna and radius) and your upper arm bone (humerus). The joint is a combination of a hinge and pivot joint. The hinge allows your arm to bend and straighten and the pivot allows your lower arm to twist and rotate.
The UCL is located on the inside of your elbow — on your pinky side. It’s made of three bands of tissue that connect your humerus to your ulna. There’s a front (anterior) band, a back (posterior) band and a diagonal (transverse) band. The anterior band is the most important for keeping your elbow stable.
There are three grades of UCL sprain injuries:
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Mild to moderate symptoms include:
Symptoms of a torn ligament include:
Overuse and trauma are the two main injuries that affect your ulnar collateral ligament (UCL).
Most cases of UCL damage are from overuse. Repetitive motion, like overhand throwing, stresses the ligament. Months or even years of continued strenuous use cause your UCL to stretch, become irritated and the tissue breaks down from small microtears. Your elbow joint becomes loose (“unstable”). Your UCL may become strained and inflamed, partially or completely torn, or one end of the ligament may pull away from the bone.
Traumatic injuries to your UCL involve a blow or hit to your elbow. They are not overuse injuries. A fall with a landing on your outstretched arm “to break your fall” is one example. This can result in an elbow dislocation or fracture that can injure your UCL.
Typically even a UCL tear may not affect your daily living activities, like carrying a bag, lifting items or other non-throwing activities. However, you may not be able to take part in activities that require throwing or repetitive, strenuous overhead arm movements.
Your healthcare provider (usually an orthopaedic specialist or a sports medicine specialist) will review your medical and athletic history and perform a physical exam. During the exam, they’ll check your range of motion, elbow strength, elbow stability, arm muscle mass and appearance and may examine your shoulder. They’ll also ask you where you feel pain.
Tests your provider may order include:
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Treatment depends on the severity of your ulnar collateral ligament (UCL) injury and how much you want to use your arm for strenuous overhead movements or throwing activities. If you have a minor UCL tear, it may heal on its own. You may find relief from pain and discomfort from nonsurgical treatments.
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With this surgery, your surgeon takes a tendon from another area of your body or a donor. The tendon is attached to the ulna and humerus to act as the new UCL. The remaining parts of the original UCL may be attached to the new graft to strengthen it.
The goal of surgery is to restore elbow stability and range of motion, improve elbow strength and relieve pain.
It’s named after the first person to undergo the procedure. Tommy John was a major league baseball pitcher who tore his UCL ligament in 1974. He sat out a season but is the first pitcher to have the surgery and successfully return to baseball.
Grafts are typically taken from one of these tendons:
Some complications are like those you’d have with any surgery, such as the risk of infection or issues related to anesthesia.
Other complications specific to UCL reconstruction include:
Proper conditioning, proper elbow movement technique and rest when you feel elbow discomfort can help prevent ulnar collateral ligament injury.
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In athletes, a pitch count limit and required rest can help protect against injury. Also, proper conditioning, stretching and strength training and proper throwing technique (avoid sidearm throwing) can help reduce the chance of UCL injury.
Recovery can take several weeks to several months if you have a UCL tear. Your recovery length depends on how much range of motion you wish to regain.
Recovery can take nine months to a year or longer. You’ll wear a hinged brace to slowly increase your range of motion. If you plan to return to rigorous throwing activities, you’ll need a personalized physical therapy and pain management program to strengthen your elbow and improve your range of motion and function.
Some tips to help reduce overuse injuries include:
This is a condition that affects the elbow of teens. It’s an injury to the growth plates. The growth plate is on the ends of the bones that form the elbow joint. Because your teen’s bones are still growing, the growth plate is not as strong as other areas of the bone and the ligaments or tendons. Throwing puts more pressure on the weakest area — the growth plate. Repetitive throwing forces can damage tissue and bones in young athletes. If your teen pitcher says they have pain in their elbow, get it looked at by your healthcare provider, orthopaedic specialist or sports medicine specialist.
A note from Cleveland Clinic
Ulnar collateral ligament injury is an inner elbow injury. It’s mainly an overuse injury and is most famously known as a baseball pitcher’s arm injury. However, this injury can happen to anyone who repeatedly uses strenuous overhead arm movements. Symptoms include pain and tenderness at your elbow. Some might feel a sudden pop at the inner elbow. If you’re not an athlete or using repetitive overhead arm movements, your elbow might heal with simple treatments such as rest, ice, medications and physical therapy. Tommy John surgery uses a tendon from another body area or a donor as a replacement ligament. You and your healthcare provider will decide which treatments are best for you based on how severe your injury is and how much you need to use strenuous overhead arm motions.
Last reviewed on 04/10/2022.
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