Kansas City RB Jamaal Charles injures left knee

By the Associated Press | September 18, 2011 | 1:45 PM EDT

DETROIT (AP) — Kansas City running back Jamaal Charles has been carted off the field midway through the first quarter Sunday with a left knee injury.

Charles, who rushed for 1,467 yards last season, was lunging toward the first down mark along the Detroit sideline when he was pushed out of bounds by defensive back Chris Houston. He landed at the feet of Detroit's mascot and immediately began clutching his left leg.

His return was announced as questionable, but the injury appeared significant. It appeared Charles might have hurt himself while planting the leg as he went out of bounds.

The 24-year-old Charles has rushed for over 1,100 yards each of the last two seasons.