Betts batted .318 for the Red Sox in 2016, with 31 home runs, 26 stolen bases, 113 RBIs and 214 hits, helping lead the Red Sox to the AL East title.
Betts' procedure on Thursday was performed by Red Sox head team orthopedist Dr. Peter Asnis at Massachusetts General Hospital.
David Adler is a reporter for MLB.com based in New York. Follow him on Twitter at @_dadler. This story was not subject to the approval of Major League Baseball or its clubs.