The injury contributed to Braun having one of the least productive full seasons of his career. He went 0 for 3 in Sunday's 5-2 loss to the Chicago Cubs to finish the year hitting .266 with 19 homers and 81 RBIs in 580 plate appearances.
Braun said Sunday the rare procedure involved going into the thumb and freezing the nerve. The problem, which carried over from the 2013 season, affected his swing.
The 2011 NL MVP missed the final 65 games of last season after being suspended as part of the Biogeneis doping scandal.
But the extra time off apparently didn't help Braun's injury.