HOUSTON -- An MRI exam of Chris Sampson's right hip revealed a small tear in the labrum, but the right-handed reliever is not expected to miss time with the injury.

Sampson underwent the MRI on Monday and was unavailable for the game against the Reds that night. He also received a cortisone injection to dull the pain.

Sampson said he probably first suffered the injury after throwing his first pitch of the season, on April 7 vs. the Cubs. He was injured fielding a ball from Lance Berkman on a Reed Johnson push bunt.

Sampson has had a couple of incidents that have reaggravated the injured area, including a play on Saturday that caused him to step awkwardly on the bag while making a play at first.

"I'm going to pitch through it," Sampson said. "It's nothing serious. You can pitch through it. I just have to make sure it's not bothering me enough to where I have to alter my mechanics to get through it. Right now, we've got it wrapped. I got a cortisone injection to calm the pain and swelling.

"I was down [Monday], got the injection, and today felt kind of jelly-like. [Wednesday], I should be A-OK, ready to go."