One second, running back Antonio Gibson was sprinting at full speed downfield. The next, he was on the ground, clutching his right knee in extreme pain. The Patriots’ week five matchup against the Buffalo Bills took a sudden turn. The diagnosis was a torn ACL, words no athlete ever wants to hear. For Gibson and the Patriots, it's a heartbreaking turn in the season. For the NFL, it’s an example of how even the strongest athletes are not immune to the game’s dangers.

Antonio Gibson has been one of New England’s most dependable players this season, highlighted by a 90-yard kickoff return touchdown in week two. The sixth-year veteran appeared in 16.6 percent of offensive snaps this season, in total racking up 25 carries for 106 yards and a touchdown. His speed, along with his versatility, made him a valuable player on New England's roster. As the team’s third option running back behind Rhamondre Stevenson and Kevin Harris, Gibson was expected to take on more responsibility after Stevenson’s struggles with fumbles. But just as Gibson began to see more playing time, an injury brought it all to a sudden halt.

ACL tears are one of football’s most devastating injuries. The anterior cruciate ligament is a strong band of tissue located in the center of the knee joint that connects the shinbone to the thighbone. When it tears, it is often due to an overextension in the knee joint, a sudden change in direction, or, as in Gibson’s case, a forceful hit to the side of the knee. This results in an extensive and painful rehabilitation process. With surgery, most athletes can return around the 9-12 month mark.

Unfortunately, Gibson’s injury is not rare. According to data from the NFL’s Electronic Health Record System, ACL tears account for roughly 15.4 percent of all lower extremity injuries and 24 percent of leg injuries in the sport. Kick returners, like Gibson, are especially vulnerable because their role requires them to sprint at full speed into multiple tacklers with little time to brace for impact. Injuries like these have been a catalyst for several rule changes made in recent years, including increasing the yardage for touchbacks to reduce kick returns. This change was designed to encourage players to take a touchback instead of attempting a risky return. By giving teams better field position when they return the ball, the NFL hopes to reduce a lot of the high speed collisions that lead to serious injuries. Still, as long as speed and collision define the game, no rule can eliminate the risk completely.

For the Patriots, Gibson’s injury is another obstacle in an already challenging season. For the rest of the league, it’s yet another example of how fragile football careers can be. Every snap or tackle has the chance of a season-ending injury. As fans, we cheer for the collisions and tackles, the breakaway runs, and spectacular returns—but behind every big play, there is a risk that even the best athletes can’t outrun.