Stars general manager Jim Nill said the injury happened during the World Cup of Hockey during the offseason. Hemsky missed Dallas' first four games after suffering what the team called a groin injury while playing for the Czech Republic. He played in only one game on Oct. 22 before re-injuring himself and then going on injured reserve.
Hemsky scored 39 points (13 goals, 26 assists) in 75 games for the Stars last season.
The 33-year-old Hemsky was one of two key Dallas forwards injured during the World Cup. All-Star Tyler Seguin missed the preseason after suffering a hairline fracture of his heel during a World Cup tuneup for Canada against the United States.
Information from The Associated Press was used in this report.