Team doctor David Altchek performed the procedure. A day earlier, Birmingham, Ala.-based doctor James Andrews reviewed an MRI and concurred with the need for surgery.
The Mets hope for Santana to be able to contribute from Opening Day next season, although that's not guaranteed.
In his final start this season, Santana was pulled after five innings in Atlanta with tightness in his shoulder/chest region. The Mets originally announced Santana had a pectoral strain. The MRI conducted Thursday, a week after Santana was pulled from the game against the Braves, revealed the precise shoulder injury.
Santana's three seasons as a Met all have ended with surgery. In 2008, he gutted through a meniscus tear in his left knee to toss a shutout the second to last game of the season against the Florida Marlins before having surgery. Last year, Santana cut short his season to have Sept. 1 arthroscopic surgery to clean out his left elbow.