Bruins forward Phil Kessel underwent successful surgery on his left shoulder on Thursday, and will need 4-6 months to recover.
The time frame means that he will not be ready for the 2009-10 regular season.
Kessel was injured on March 10 against the Blue Jackets when he was checked into the boards by defenseman Jan Hejda.
Kessel Has Surgery, Out 4-6 Months