Jason Hammel will have arthroscopic surgery on his right knee to remove loose cartilage. Hammel said on Sunday morning that the surgery will be performed by team physician Dr. John Wilckens. The Orioles hope the procedure takes place on Monday."Obviously, it's not what I want to do, but it's what needs to be done. I can't keep pitching on a bad leg and start putting pressure on my arm and start hurting stuff there," Hammel said.Even though Hammel thinks he can return in three-to-four weeks, Orioles manager Buck Showalter thinksearly Septemberis more realistic."It's going to be pretty routine surgery,"Hammel said.Hammel, who's been bothered all season by discomfort in the right knee, reinjured the knee in the fourth inning of Friday's game. He was officially placed on the disabled list on Sunday."It wasn't easy. It's something that I could rest for maybe aweek," Hammel said. "It might go back to the way it was. You're running the risk every time you go out there."
Hammel, who has an 8-6 record with a 3.54 ERA. He was obtained by the Orioles in February from Colorado in a deal that sent Jeremy Guthrie to the Rockies.He said he would head to Sarasota, Fla. to begin rehab about a week after the surgery. The Orioles had hoped to delay the procedure until after the season."It's a decision that had to be made," Hammel said. "The reason why I was pitching through was it didn't hurt at the time. Two days ago, it hurt a lot."