By now, most baseball fans know the story of Tommy John surgery. In 1974, John -- a solid pitcher for a decade -- blew out his elbow while pitching for Los Angeles against the Montreal Expos. “Blew out his elbow” is not a medical term, of course, but there was no need for medical terms when it came to pitchers in 1974. Once a pitcher tore the ulnar collateral ligament in his pitching arm, he was finished. That was exactly what Tommy John had done.