Detroit Pistons All-Star forward Blake Griffin (pictured) underwent arthroscopic surgery on his injured knee and will be out indefinitely, according to the team.

Griffin has missed nearly 20 games this season because of his injured left knee.  He has not played since December 28th, when the team lost to the San Antonio Spurs.

Blake, who's a six-time All-Star during his career with the Los Angeles Clippers and the Pistons, has two years remaining on his contract (the last year is a $39 million player option) with Detroit.

The Pistons are 13-24 on the season (entering Tuesday night's game against Cleveland), and are four games behind the Brooklyn Nets for the eighth and final playoff spot in the Eastern Conference.