UCL Injury, Repair, and Tommy John Reconstruction
The ulnar collateral ligament, or UCL, is the primary stabilizer on the inner side of the elbow during overhead throwing.
Symptoms and evaluation
UCL injuries most often cause pain on the inner side of the elbow during the late cocking or acceleration phases of throwing. Athletes may report a pop, loss of velocity, reduced accuracy, decreased endurance, or inability to throw at prior intensity. Numbness in the ring and small fingers can occur when the ulnar nerve is also irritated. The evaluation includes throwing history, workload, position, competition level, recent performance changes, elbow motion and stability, flexor-pronator strength, ulnar nerve function, shoulder motion, and kinetic-chain factors.
Imaging
X-rays can show bone spurs, stress changes, loose bodies, calcification, or growth-plate injury in a younger athlete. MRI assesses the ligament and associated structures. MR arthrogram or dynamic stress ultrasound may provide additional information in selected partial tears or when functional laxity must be clarified. Imaging findings are interpreted alongside symptoms and examination because adaptive changes can be present in experienced throwers who do not have a functionally important tear.
Nonsurgical care and PRP
Many partial tears and some complete tears can begin with complete rest from throwing followed by rehabilitation. Treatment addresses elbow and shoulder motion, forearm and flexor-pronator strength, rotator cuff endurance, scapular control, core and lower-extremity mechanics, workload, and throwing technique. A structured interval throwing program begins only after symptoms, examination, motion, and strength have improved. PRP may be considered for selected partial tears, but evidence remains evolving and it does not replace rest, rehabilitation, workload correction, and progressive throwing.
UCL repair versus reconstruction
UCL repair preserves and reattaches the native ligament and may be reinforced with an internal brace. It is most appropriate for selected relatively acute tears near the ligament's attachment when tissue quality is healthy and chronic degeneration is limited. Tommy John reconstruction uses a tendon graft to rebuild the ligament. It is generally favored for chronic attritional insufficiency, midsubstance tears, poor tissue quality, failed prior treatment, and injuries not suitable for direct repair. Associated ulnar nerve symptoms, loose bodies, or bone spurs may also require treatment.
Recovery and expectations
Rehabilitation is coordinated among the surgeon, therapist, athletic trainer, athlete, and coaching staff. Motion and strength are restored gradually before an interval throwing program begins. Recovery after reconstruction commonly takes approximately 12 to 18 months, particularly for pitchers. Selected repairs may progress faster, but return is based on healing, position, sport, strength, command, endurance, and recovery. Surgery restores stability; it does not guarantee increased velocity or a return to the previous competitive level.
This information is educational and is not a substitute for an individualized medical evaluation. Written and medically reviewed by Michael L. Knudsen, MD | Last reviewed: July 2026
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