ST. LOUIS (AP) -Cardinals pitcher Chris Carpenter, sidelined since opening day with an elbow injury, will undergo arthroscopic surgery early next week after suffering a setback in his rehab program.
Carpenter, a 15-game winner last year and the NL Cy Young award winner in 2005, will be out at least three months, the team said Saturday. An exam on Friday with Dr. George Paletta, the team's medical supervisor, revealed recurrent swelling, stiffness and loss of motion.
Carpenter threw about 60 pitches to teammates in a simulated game on Tuesday in Milwaukee, and said he felt fine afterward. He went on the 15-day disabled list on April 10 with swelling in the elbow that developed a few hours after he allowed five runs in six innings in a season-opening loss to the New York Mets on April 1.
The surgery was announced during the game against the Milwaukee Brewers on Saturday. The Cardinals had been hoping Carpenter would return to the rotation on Tuesday.

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