In an interview with Comcast SportsNet on Monday, Sixers CEO Adam Aron discussed the Andrew Bynum trade, the center’s ailing knees and whether the team plans to re-sign him.

“This is a move that should have worked,” Aron said. “But, unfortunately, he got an injury in September and it’s been compounded since, post-trade and we haven’t seen a day. The fans hopes were justifiably high that the Sixers had made a move, a bold move, that would catapult us back into the top teams in the NBA. It hasn’t worked.”

Late last week, Bynum said he suffered a setback and was unsure that he’d play this season. Then, this weekend, Sixers general manager Tony DiLeo revealed that Bynum is considering season-ending surgery. Aron said he first learned that surgery was an option “a couple days ago.”

“The issue for this season is not whether Andrew Bynum has surgery, it’s what are the condition of his knees?” Aron said. “We thought he was going to play opening day. His doctors gave us a four-week delay, then another four-week delay. In December, we went out publicly and said he would be out indefinitely because we just didn’t know when he would be back. If you go back in time just three weeks ago, Andrew himself was telling everyone that he thought he’d be actively playing after the All-Star break. He did practice with the team about 10 days ago. There were high hopes and he was working out hard in February behind the scenes at the practice facility. But when he practiced with the team five-on-five his knees started swelling up and that was a big setback.”

Late last week, when Bynum was asked whether his knees are degenerative, he didn’t directly answer the question, saying instead that “50 percent of the people in the United States” are in the same situation. Are Bynum’s knees degenerative?

“I can’t get into his exact medical condition,” Aron said. “But I can say this, which is obvious to all of us: All season long he’s had bone bruise issues. He’s had cartilage problems. It’s March. He’s still not playing. He hasn’t played basketball since last May. Clearly, Andrew is dealing with some knee problems that have prevented him from playing in the NBA.”