(WMC-TV) - St. Louis Cardinals ace Chris Carpenter will undergo season-ending surgery to repair a nerve issue in his shoulder that's sidelined him since spring training.
The 37-year-old Carpenter wants to continue pitching, and he and the Cardinals are optimistic he can return by spring training in 2013.
The Cardinals had been hopeful Carpenter would pitch after the All-Star break until recently.
A bullpen throwing session was canceled Monday because strength had not returned to his shoulder.
Carpenter has been told the surgery to relieve compressed nerves in the shoulder could allow him to resume his career next season.
"I went down and say Dr. [Gregory] Pearl on Thursday, and he really believes he can fix all the issues I've been dealing with since '08," Carpenter said. "I'm excited about the way he presented it and the outcome that he might be able to get. He said nothing is guaranteed, but he feels like he can help me, and that's something that is exciting for me and my family."
Carpenter has dealt since 2008 with an injury called thoracic outlet syndrome that causes numbness to his arm, shoulder, neck and face in various degrees.
St. Louis General Manager John Mozeliak says recovery time is three-to-six months.
The surgery is set for July 19 in Dallas.
Carpenter helped lead the Cardinals to the World Series title last season, going 4-0 with a 3.25 ERA in six postseason starts.