Tommy John surgery, known in medical practice as ulnar collateral ligament (UCL) reconstruction, is a surgical procedure in which a ligament in the medial elbow is replaced with a tendon from elsewhere in the body. The procedure is common among collegiate and professional athletes in several sports, most notably baseball. The procedure was performed by Dr. Frank Jobe, who today serves as a Special Advisor to the Los Angeles Dodgers, and is named after former major league pitcher Tommy John whose 288 career victories ranks seventh all time among left handed pitchers.