Curtis Martin had a superb season for the New York Jets in 2004, rushing for an NFL-leading 1,697 yards to go along with 12 touchdowns. And the Hall of Famer apparently did it all with a torn MCL.
"My MCL had almost a Grade 3 tear in it," he told Tim Benz of the Pittsburgh Tribune-Review on his Breakfast with Benz podcast (h/t Bryan DeArdo of CBS Sports). "It was so loose. I played with it from I believe the sixth or seventh game throughout the rest of the season.