Performance Outcomes after Ulnar Collateral Ligament Tears in Major League Baseball Pitchers

Area of Science:

• Orthopedic Surgery
• Sports Medicine
• Baseball Analytics

Background:

• Ulnar collateral ligament (UCL) injuries are common in baseball pitchers.
• Surgical outcomes for UCL injuries in pitchers are of significant interest to players, teams, and medical professionals.

Purpose of the Study:

• To evaluate the performance and salary outcomes of Major League Baseball (MLB) pitchers after undergoing UCL surgery.
• To identify factors predicting return-to-play and post-injury salary adjustments.

Main Methods:

• Retrospective cohort study of 277 MLB pitchers undergoing UCL surgery between 2000 and 2024.
• Analysis of return-to-play rates (85%) and performance metrics (ERA, FIP, WHIP) pre- and post-surgery.
• Multivariable regression models to assess predictors of salary and return-to-play.

Main Results:

• Performance metrics, including earned run average (ERA), fielding independent pitching (FIP), and walks plus hits per inning pitched (WHIP), significantly worsened post-surgery.
• Despite performance declines, average pitcher salaries increased by 16.6% after era adjustment.
• Multiyear contract status was the sole significant predictor of return-to-play and independently predicted higher post-injury salary.

Conclusions:

• MLB pitchers experience substantial performance decrements following UCL surgery.
• Salary increases post-surgery are primarily driven by service time and contractual security, not immediate performance.
• These findings highlight a disconnect between on-field output and financial compensation in MLB pitchers post-UCL surgery.