Martinez suffered a torn ACL during his offseason conditioning and last week had a number of initial procedures. He had microfracture surgery, as well as operations to repair both the medial and lateral meniscus in the knee.
Noted surgeon Dr. Richard Steadman performed the procedures in Vail, Colorado and said in the Tigers' release that Martinez should be ready to undergo ACL reconstruction in approximately six-to-eight weeks.
The Tigers expect Martinez to be sidelined for the entire 2012 season.
Martinez batted .330 with 40 doubles, 12 home runs and 103 runs batted in last season, his first with the Tigers. He spent most of the 2011 campaign as the club's designated hitter.
In response, the Tigers moved quickly to add another power bat and signed free agent first baseman Prince Fielder.