Major League Baseball players win more games following Tommy John surgery, study suggests

In the new study, "Rate of Return to Pitching and Performance after Tommy John Surgery in Major League Baseball Pitchers," presented today at the 2014 Annual Meeting of the American Academy of Orthopaedic Surgeons (AAOS), researchers looked at the rate of return to MLB pitching following UCLR, the level of performance in pitchers returning to MLB, and the difference in overall performance between pitchers who underwent UCLR and demographic-matched controls who did not. Researchers evaluated UCLR pitchers between 1986 and 2012 using a number of performance-based statistics and compared them with matched controls: age, body mass index (BMI), position, handedness and MLB experience.

In the year prior to surgery, the UCLR pitchers were outperformed by controls in terms of the number of innings pitched, games played and winning percentage. However, after undergoing UCLR, pitchers allowed significantly fewer walks and hits per inning pitched (WHIP), won a higher percentage of games, and recorded lower earned run averages (ERA) than prior to their surgeries. The UCLR pitchers also recorded higher winning percentages and lower WHIP and ERA in their post-surgical career than the control group. Overall, 83 percent of UCLR patients were able to return to MLB, and their careers on average lasted an additional 3.9 years.

The authors of the study concluded that there is a high rate of pitchers returning to MLB following UCLR, with a significant improvement in pitching performance.