Detroit Pistons forward Blake Griffin had knee surgery today and will be out for an indefinite period of time.

The team says that Griffin underwent a successful arthroscopic debridement of his left knee.

A six-time All-Star, Griffin is having an extremely disappointing season, averaging 15.5 points, 4.7 rebounds and 3.3 assists per outing.

Here’s the Detroit News reporting:

Griffin has struggled this season, missing the last four games; he last played in the loss San Antonio Spurs on Dec. 28, finishing with 12 points on 3-of-16 shooting — with 3-of-10 on 3-pointers. He missed the remainder of the western trip, including a notable matchup against his former team, the Los Angeles Clippers, on Jan. 2.

Last season, Griffin had the highest production, posting a career-best 24.5 points, along with 7.5 rebounds and 5.4 assists and was voted third-team All-NBA. Following a surgical procedure last summer, Griffin was expecting to return in a similar form, but he had setbacks, causing him to be limited in the preseason and then to miss the first 10 games of the regular season…

Griffin is in the third year of a five-year contract worth $173 million.

The Pistons are 13-24 this season, and face major decisions to make in regard to Andre Drummond, who openly plans to test free agency this summer. It wouldn’t be a surprise if they were to make a huge trade or two in the coming weeks, before February’s trade deadline.