His recovery time is expected to last 4-6 months.
Maatta was third among rookie defenseman this season with nine goals and 29 points in 78 games. He was a plus-8 while averaging 18:29 of ice time per game.
The news of Maatta's surgery comes one day after the Penguins announced top defense prospect Derrick Pouliot will need 4-6 months to recover from surgery to repair a labral tear in his shoulder.
In 70 games with the Portland Winterhawks of the Western Hockey League, Pouliot 17 goals and 70 points. He also led all WHL defensemen in the playoffs with 32 points in 21 games.
Pouliot (No. 8) and Maatta (No. 22) were taken by the Penguins in the first round of the 2012 NHL Draft.
The Penguins also announced a four-month recovery time for forward Beau Bennett, who had wrist surgery Thursday.
Bennett missed four months during the regular season with the injury, and also was scratched from Game 7 of the Penguins' Eastern Conference Second Round series against the New York Rangers because of soreness in the wrist.