Chiefs RB Smith carted off field with sprained knee
Smith started in place of Larry Johnson, benched for disciplinary problems.
Kansas City was leading 21-3 when Smith got hurt. He hurtled into the line on a first-down run and gained 5 yards before he was tackled by safety Will Allen.
Earlier in the game, Smith scored on a 1-yard run.
Copyright 2008 by The Associated Press
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