Elbow UCL Injuries
Background
The ulnar collateral ligament, or UCL, is a band of tissue on the inside of the elbow that helps keep the joint stable. It is placed under significant stress during overhead throwing, particularly in baseball pitchers. A UCL injury may develop gradually from repeated throwing or occur suddenly during a single throw.
Injuries range from a partial tear to a complete tear. The location and severity of the tear, along with an athlete’s sport and position, help determine the best treatment.
Symptoms
Patients with a UCL injury may experience:
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Pain on the inside of the elbow, especially while throwing
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A sudden pop during a throw
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Decreased throwing velocity or control
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Difficulty throwing at their usual intensity
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Elbow soreness that persists after activity
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Numbness or tingling in the ring and small fingers if the nearby ulnar nerve is irritated
Diagnosis
Diagnosis begins with a discussion of when the pain started, changes in throwing performance, and a physical examination. The examination checks for tenderness and stability on the inside of the elbow. X-rays can identify associated bone changes, while an MRI or MR arthrogram can help show the location and extent of the ligament injury.
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The MRI findings are considered alongside the athlete’s symptoms and examination. A partial tear in an athlete who can throw comfortably may be treated differently from a complete tear in a pitcher who cannot return to throwing.
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Flexor-pronator strains: The muscles along the inside of the forearm help support the elbow during throwing. A strain of these muscles can cause pain in the same area as a UCL injury, and the two can occur together. During the examination, we assess the muscles and ligament separately to identify the source of pain and guide treatment.
Treament Options
Treatment depends on the type of tear, the athlete’s goals, and whether the elbow remains painful or unstable during throwing.
Nonoperative Treatment
Many partial UCL injuries can initially be treated without surgery. Treatment typically includes a break from throwing, rehabilitation to restore motion and strength, and a gradual throwing program once symptoms improve. Therapy also addresses the shoulder, core, and lower body, which all contribute to throwing mechanics.
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An injection, such as platelet-rich plasma, may be discussed in selected cases.
UCL Repair
Some athletes with a tear near the ligament’s attachment and otherwise healthy ligament tissue may be candidates for UCL repair. The ligament is reattached to the bone, often with suture augmentation to support the repair as it heals. Repair preserves the athlete’s own ligament and may allow a faster return than reconstruction in appropriately selected patients.
UCL Reconstruction
When the ligament cannot be reliably repaired, UCL reconstruction, often called Tommy John surgery, may be recommended. The damaged ligament is replaced with a tendon graft. Most commonly, the graft is taken from another part of the patient’s body, such as the forearm or hamstring. An allograft, or donor tendon, may also be used in selected cases. Graft choice is discussed based on the athlete’s anatomy, goals, and prior surgeries.
Return to Sport
Return to throwing follows a gradual progression based on pain, motion, strength, elbow stability, and tolerance for increasing throwing distance and intensity. The athlete must complete the throwing program before returning to competition.
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After UCL repair, selected athletes have returned to play in approximately six to nine months. After UCL reconstruction, return to competition averages about 12 months and may take 12 to 18 months, especially for pitchers. These are guides rather than guaranteed clearance dates