KANSAS CITY, Mo. — A's left-hander Dallas Braden's surgically repaired left shoulder is not recovering as well as hoped, so the pitcher will undergo an exploratory operation to try to get to the root of the problem.

It was looking more and more doubtful that Braden would pitch at all for the A's in 2012, and this development would seem to guarantee he is out for the season.

Braden has been sidelined since undergoing surgery to repair the capsule in his left shoulder in May 2011. In spring training, he was hopeful of joining the rotation sometime early this season, but multiple setbacks have delayed him.

"His shoulder hasn't responded in the last couple of weeks in the fashion we had hoped," A's manager Bob Melvin said. "He will have another surgery. When that is, we're not sure yet."

Braden traveled to New York recently to have his shoulder examined by Dr. David Altchek, who performed his first surgery.

The A's were hopeful of getting Braden back at some point to add some veteran depth to their rotation. It does appear that left-hander Brett Anderson will return shortly after being sidelined all season due to Tommy John elbow surgery.

Anderson will make another rehab start for Triple-A Sacramento on Wednesday to get his pitch count near 100. Barring a setback, he figures to be ready to rejoin the A's after that.

In other injury news, Melvin said an MRI on third baseman Brandon Inge's throwing shoulder "didn't show anything that would suggest a long stint" on the disabled list. Inge was placed on the 15-day D.L. on Tuesday, and Josh Donaldson was recalled from Sacramento to play third in his absence.


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"We're holding out hope that (Inge returns) close to, if not on the 15 days when they're up," Melvin said.