Prospal, in his first season with New York, was injured Saturday night in the Rangers' 3-2 overtime loss to the New York Islanders. The surgery took place on Monday morning.
In 38 games this season, while playing alongside NHL goal leader Marian Gaborik, the 34-year-old left winger has eight goals and 32 points. His 24 assists are tops on the Rangers and 19th best in the league.
Prospal wasn't limited by the injury on Saturday night as he logged 22 minutes, 19 seconds of action.