Lidge, who has not pitched since Saturday because of inflammation in his right knee, threw a bullpen session Friday afternoon at Citizens Bank Park and said it went well. He estimated he threw 30 pitches without pain.
"The amount of pitches I threw didn't bother me," Lidge said. "There's no question that if I kind of revert back to some bad mechanics that I'll probably aggravate it. That being said, the way I threw today was real encouraging. I'll be ready to go now. I'll be able to avoid the DL."
Lidge was unlikely to pitch Friday, but said he should be available Saturday against the New York Mets.
Lidge said he had felt discomfort pitching out of the stretch because of bad mechanics. He said Friday he has rectified that problem.
"By and large, this isn't a big mechanical adjustment," Lidge said. "But if I fall down too much on my back side on any particular pitch, that's when it pinches. It's going to tell me right away if I'm not throwing the way I need to be. The good thing about this mechanical adjustment is that pitchers want to be tall on their back side so we can get some good downward angle on the plane. I was lacking that a lot. This is a good adjustment for me."
Lidge underwent an MRI, which showed no tears, and he received a cortisone shot April 20. He had surgery on the same knee twice before the 2008 season.
"It might not be something that goes away in a week or two. It might be a month or two," Lidge said. "But at some point, it will go away, and if I keep throwing correctly, that'll be what gets it there."
Todd Zolecki is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.