Sprained knee could keep Portis out of Week 11 showdown

ASHBURN, Va. -- Washington Redskins running back Clinton Portis is unable to practice because of a sprained knee, and coach Jim Zorn says the running back is "50-50" for Sunday night's game against the Dallas Cowboys.

Portis bruised his knee on the final play of the first quarter of last week's 23-6 loss to the Pittsburgh Steelers but returned for the next series and finished the game. The pain got progressively worse after Portis was treated following the game, however, and Zorn said Monday that Portis has a bone bruise on the femur as well as a sprain.

Portis is second in the league in rushing with 995 yards on 200 carries.

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