As of 2024, 36% of all active Major League pitchers have undergone Tommy John surgery. That number has been climbing steadily for years, and the trend shows no signs of slowing down. The surgery, which reconstructs the ligament on the inner side of the elbow, has become so common that it’s practically a rite of passage in professional baseball.
How Common It Is at the Pro Level
More than one in three MLB pitchers currently on a roster have had their elbow ligament surgically replaced. That’s a staggering figure when you consider that this operation didn’t even exist before 1974. The rate continues to increase yearly, driven in part by the physical demands modern baseball places on pitching arms.
What makes this number especially striking is that it represents only pitchers who made it to the majors despite needing the surgery. It doesn’t account for the countless minor leaguers and amateur players who had the procedure and never reached the big leagues.
The Surgery Is Hitting Younger Players Hardest
The most alarming trend isn’t what’s happening in the majors. It’s what’s happening in high school. The 15-to-19 age group now has a higher annual rate of this surgery than any other demographic. A national study covering 2013 to 2015 found that the median age of patients dropped from 20 to 18, and 66.4% of all cases occurred in patients under 20.
Rates among adolescent athletes have been rising as fast as 9% per year. Year-round travel baseball, early specialization in pitching, and competitive pressure to throw hard at younger ages all contribute. Teenage arms are still developing, and the growth plates near the elbow are especially vulnerable to the repetitive stress of throwing.
Velocity Alone Doesn’t Predict the Injury
A common assumption is that throwing harder automatically means a higher risk of blowing out your elbow. The reality is more nuanced. A long-term study tracking 305 professional pitchers, published in The Orthopaedic Journal of Sports Medicine, found no statistically significant link between fastball velocity and the likelihood of needing surgery. Body size, history of previous surgery, role as a starter versus reliever, and even existing abnormalities visible on MRI scans also failed to predict who would get hurt.
The biomechanics explain why this is counterintuitive. Within a single pitcher, throwing harder does increase the torque on the elbow. But across different pitchers, that relationship breaks down. Two pitchers can throw the same speed while putting very different amounts of stress on their elbows, because their mechanics, arm slots, and body proportions distribute force differently. So velocity on its own is a poor predictor of who ends up on the operating table.
Return-to-Play Rates After Surgery
The good news is that the surgery works well for most players. Between 80% and 95% of baseball players return to competition without long-term complications, according to Cleveland Clinic. Many pitchers come back throwing just as hard, and some report feeling better than they did before the injury, particularly if they’d been pitching through a partially torn ligament for months or years.
The recovery timeline is significant, though. Most pitchers need 12 to 18 months before they’re back in competitive games. That means missing an entire season at minimum, and often parts of a second. For younger players, that lost development time can reshape a career trajectory even if the surgery itself goes perfectly.
Why the Numbers Keep Rising
Several forces are pushing the rate higher simultaneously. Youth pitchers are specializing earlier, playing more games per year, and facing pressure to showcase velocity at younger ages. At the professional level, the emphasis on high-velocity fastballs and max-effort pitching has intensified over the past two decades. Pitchers throw fewer innings than they did a generation ago, but each pitch tends to involve more effort.
There’s also a selection effect at work. Because the surgery has become so successful and so normalized, players and their families are less hesitant to go through with it. Some young pitchers view it almost as an inevitable step rather than a serious surgical procedure. That cultural shift likely contributes to the rising numbers, particularly among teenagers, where the annual surgical rate continues to climb faster than in any other age group.