One-time All-Star center Andrew Bynum, who has been unable to play this season because of bone bruises and damaged cartilage in both knees, will have surgery Tuesday to clean out debris both joints, according to a source close to the situation.

It was originally reported in November that Bynum’s knee injuries were likely to delay his Sixers debut until late March at the earliest, could cost him the entire season, require surgery and potentially become a career-threatening condition.

Bynum was originally diagnosed with a bone bruise in his right knee in September, a month after the Sixers acquired him from the Los Angeles Lakers in a blockbuster four-team trade in August. The Sixers nevertheless expected Bynum to be ready to play in the season opener, but as the season progressed, the team and player repeatedly delayed the date of his expected debut. Bynum was diagnosed with a “mirror issue” in his left knee in November, when a piece of cartilage broke loose and his joint swelled after going bowling.

Bynum is making $16.9 million this season and will become an unrestricted free agent in July. He’s been hoping to land a long-term deal and nine-figure pay day.

“Well, no one anticipated that this would happen, that Bynum wouldn’t be able to play any – so far he hasn’t played any games,” Sixers president Rod Thorn said on March 13. “No one was anticipating that. We were hopeful that he might be able to play when the season started, then it’s been a series of things and he hasn’t been able to play. That’s been tough. We’ve got a bunch of good shooters that would have fit, I think, pretty well around him.”