Raiders running back Darren McFadden discovered Sunday what every other running back to face the Houston Texans already had this season: It's difficult.

McFadden averaged 115 yards the first three games but rushed for only 47 on Sunday before exiting the game with a right hamstring injury in the fourth quarter. Backup Michael Bush added 40 yards.

"They have a good front seven," McFadden said of the Texans. "Those guys are good getting off blocks and making plays."

McFadden also said he felt as if the Raiders did a decent job running the ball, all things considered.

Overall, the Raiders had 118 yards rushing, well more than twice the 54.3 average allowed by the Texans in their first three games. Yet, Houston succeeded in keeping intact its streak of not allowing a running back more than 55 yards.

McFadden's injury cleared the way for Bush to get his most significant workload this season. He rushed seven times and showed that the broken left thumb that sidelined him the first two games no longer is a concern.

McFadden suffered his injury at the end of a 23-yard run, as he attempted to outrun a defender in the open field. He grabbed his hamstring and headed out of bounds.

"I was trying to go for another gear and I just pulled up," McFadden said. "I tried to get out first because I didn't want to pull it too fast."

His status for next Sunday's game against the San Diego Chargers will be evaluated today.

  • Raiders quarterback Bruce Gradkowski suffered a right shoulder injury five minutes into the third quarter when he was drilled by Texans strong safety Bernard Pollard at the end of an 8-yard run.

    "They kind of tell me to get down," Gradkowski said of his coaches. "It's just my nature to get all I can. A couple of times I've got to be smarter than that and get down, and a couple of times it just happened so fast you're just stuck in between and you've just got to take the hit. I've got to be smarter than that and protect my body."

    He exited the field, spent a few minutes in the locker room but returned for Oakland's next possession and played the rest of the game. He said he expects to start against the Chargers.

  • The Texans entered the game with the league's worst-ranked pass defense at an average of 368.7 yards per game. Also, opposing quarterbacks had completed 72.8 percent of their passes and compiled a 116.8 passer rating, both worst pass-defense marks in the league.

    Gradkowski capitalized, to some extent, by completing 24 of 39 passes (61.5 percent) for 278 yards and two touchdowns. He had a 78.8 passer rating.

  • Houston No. 1 wide receiver Andre Johnson was deactivated because of the lingering effects of an ankle injury he suffered earlier this season. That freed up Raiders cornerback Nnamdi Asomugha to help against Kevin Walter and Jacoby Jones, as well as tight end Owen Daniels. That trio combined for six receptions for 55 yards. Asomugha allowed one reception for 13 yards to Walter.

  • Raiders kicker Sebastian Janikowski hoped to put behind him the lingering bad taste from missing three field-goal attempts, including a 32-yarder on the game's final play, in a 24-23 loss at the Arizona Cardinals a week earlier by kicking a game-winner Sunday. He didn't get the chance.

    His lone field-goal attempt came midway through the fourth quarter, with the Raiders trailing 31-21. He converted from 39 yards.

  • The Raiders were the league's most-penalized team before Sunday's game, with 33 infractions for a league-high 290 yards. They made it through the first three-plus quarters against the Texans without a penalty. Brandon Myers' holding penalty five minutes into the fourth quarter and an intentional grounding penalty against Gradkowski were their lone transgressions.

  • Left offensive tackle Langston Walker and left guard Daniel Loper allowed sacks that resulted in fumbles by Gradkowski. Loper recovered the first fumble. Texans defensive tackle Amobi Okoye recovered the second one.

  • Most of the Raiders and Texans played with some pink on their shoes, pink gloves or some other pink attire as a way of showing support for breast cancer awareness.

  • Wide receiver Chaz Schilens (knee), left guard Robert Gallery (hamstring) and defensive tackle John Henderson (foot) were among the eight players deactivated by Oakland.