Tommy John surgery, which can save a pitcher's career, reconstructs a torn ligament in the inner side of the elbow that would otherwise stabilize the elbow during throws.

Check out a list of pitchers that received Tommy John surgery, an elbow procedure that can repair a pitcher's deteriorated arm.

Experience a century of America's healthcare advances with this medical visualization, tracing a sampling of healthcare innovations from head to toe.

How pitcher Pedro Martinez helped reverse the curse of the Red Sox

The team had not won a World Series for nearly 100 years—while their rivals, the Yankees, had won 26. The Dominican pitcher joined the club in 1997 and helped lead the team to reverse the curse.

Some say baseball's drug problem goes back to the late 1800s

At age 32, pitcher James “Pud” Galvin was feeling tired and decided to take "the Brown-Séquard elixir," which contained a testicular fluid from dogs and guinea pigs, believed to invigorate tired bodies. It might've worked: Galvin pitched a two-hit shutout the next day.

Sidearm pitchers—who throw the ball at an odd angle, sometimes very close to the ground—are a rarity in modern baseball, which often makes them more difficult for batters to hit.

See what analysis of one man's amputated leg, donated to The Bone Museum, tells us about his otherwise invisible pain.

An experimental bionic knee has been directly integrated into the user's muscle and bone—not an external socket—marking a significant prosthetic advancement.

The first successful organ transplant was performed in 1954

The successful kidney transplant procedure, at what's now-called Brigham and and Women's Hospital, ushered in a new medical era and gave hope to patients with organ failure. The recipient, 23-year-old Richard Herrick, lived eight more years after receiving the donated organ from his living twin brother, Ronald.

In 1975, a Major League Baseball clause that kept players legally tied to their teams after retirement was dismantled, creating the modern concept of free agency.

How personalized gene-editing saved a baby's life

KJ Muldoon had a 50% chance of surviving a genetic mutation until doctors developed a one-of-a-kind gene-editing therapy. In an interview with one of the researchers behind the treatment, learn what it will take to make personalized genetic medicine possible for everyone.

The 2026 MLB season is the first to allow players to challenge umpires' calls on balls and strikes.

Inside MLB's robo-umping experiment

Human umpires call roughly 94% of pitches right overall, but performance reduces on borderline pitches in high-leverage moments, the calls that shape game outcomes most. A professor and historian analyze early experiments with the full "robot ump" system that helped shape MLB's decision to implement a compromise "challenge" system.

Limb regeneration research may lead to treatments for arthritis

For scientists pursuing the cure for arthritis, the holy grail of discoveries lies in how to regrow healthy cartilage inside human joints. While this feat has so far resisted our best scientific attempts, there are plenty of other human tissues—such as the liver and fingertips—that will successfully regenerate.

How Shohei Ohtani made baseball fun again

To rise to the level of Major League Baseball in recent decades, a player needs to become a specialist in at least one of the sport's many skills: hitting, pitching, throwing, running, fielding. For decades, this specialization has made a so-called...

MLB 2023 rules changes were the most dramatic alterations in decades, drastically speeding up the game.

Watch real knee surgery footage to see what arthritis looks like up close.

Explore the data behind every Major League Baseball player's success rate with ABS, its new tech-assisted challenge system.

MLB pitchers were charged with benefiting from sports betting

In November 2025, two pitchers for the Cleveland Guardians were charged with coordinating with sports bettors to enrich themselves and others. In many instances, they shared the kinds of pitches they would throw at specific points in the game. Bettors then placed money on those actions.

Each July 1, six-time Major League Baseball All-Star Bobby Bonilla gets $1.19M from the New York Mets, thanks to a 25-year-long deferred payment agreement.

Visualize how changes to lineups, driven by modern analytics, could have changed one of MLB's most iconic moments.

Some athletes warm up with equipment from other sports

Baseball superstar Shohei Ohtani uses a cricket bat; his teammate Yoshinobu Yamamoto throws a javelin. Quarterback CJ Stroud shoots free throws. The reasons are partially physical (it's good to exercise different parts of your body) and partially mental (it's nice to take the pressure off with someone else's game).

The story behind one infamous World Series moment

“The Bartman Incident” during Game 6 of the 2003 NLCS forever changed the life of Cubs fan Steve Bartman, who quickly descended into anonymity. This 2005 ESPN story attempts to find answers behind the notorious Bartman.

An eephus is a high-arc pitch usually thrown by position players filling in for pitchers in blowout games.

Before 1920, during the Deadball Era, a single baseball was used throughout a Major League game, leading to a notoriously dirty style of play.

The surgeon who tried to save John Lennon says he can’t forget that night

Frank Veteran was a resident in 1980 on the night John Lennon was shot in New York. For years afterward, he tried to process the sight of seeing the Beatle dying in the hospital, including through art, but he says that the memories from the experience are still vivid.

Tech entrepreneur Bryan Johnson's mission to live forever

Johnson has invested millions of dollars into developing a biohacking program he believes will extend his life beyond typical expectations, relying on medical professionals to reduce his "biological age." Most notably, he drew significant public attention with reports of blood-swapping with his teenage son.

Read why one man agreed to get a pig kidney in 2025 to replace his own failing organ

The 68-year-old New Hampshire man told USA Today that a motivator for the experimental surgery was his belief that he was going to die anyway, and other people suffering from kidney disease could gain valuable insights. Yet the surgery bought him time—he lived 271 days with a pig organ and later received a human kidney transplant. Clinical trials began in 2026 to test the pig xenotransplants in more people.

Breaking down the knee's anatomy

The human knee is a remarkably complex structure carrying the full weight of the body throughout a person's life while allowing a number of complex twists, flexes, and extensions. It's also one of the body's biggest weaknesses—the location of chronic pain and replacement surgeries for millions of Americans.

Statcast, MLB's sophisticated real-time data analytics system, runs machine learning models in the 23-second gap between every pitch.

In 2001, Little League World Series pitcher Danny Almonte was a widely praised superstar until it was revealed he was 2 years older than his competitors.

Long before Major League Baseball began allowing instant replay for balls and strikes, an umpire reluctantly used the technology to determine whether a hit was a home run, a move that inadvertently ushered in a new era for the sport.

The MLB's reserve clause gave owners rights to players after their contracts expired

The clause was added to contracts in 1879, allowing owners to hang on to players after the expiration of their contracts, sometimes in perpetuity.

Pickleball injuries were responsible for $350M in medical costs in 2023

Unsurprisingly, picklers over 50 account for 90% of the injuries, with the most common being sprains, strains, and fractures. Experts say a substantial pregame warm-up can prevent most injuries.

Watch a histotripsy procedure, a novel noninvasive cancer treatment approach used to destroy tumors with high-intensity sound waves.

Minor leaguers once unionized for better pay, housing, and medical care

For decades, Minor League baseball players endured overcrowded housing, indifferent medical care, and all-night bus rides for a chance to make it to “The Show.” And they did it for as little as $4,800 a year.

100 moments that shaped baseball history

Published in 2018 by baseball historian Jacob Kornhauser, this list examines the defining moments throughout more than a century of play on the field, from Pittsburgh Pirates pitcher Dock Ellis purportedly throwing a no-hitter while on acid to Jackie Robinson breaking the color barrier.