"He played through it, his knee was swollen a little bit," Lue told ESPN's Dave McMenamin. "Then he came and got the MRI after that third game, and so, now we have the results.
"He was already heading for surgery," Lue said. "It was already (hurt). Loose bodies were already in there so he just played through it and then after it got to a certain point he got the MRI and he found out it was loose bodies floating around."
With Love expected to miss six weeks, Lue realizes he'll need to get creative in order to avoid tiring out what's left of the Cavaliers' rotation.
"Guys are going to get their proper rest going forward, even though Kevin is out," Lue said. "We're going to be fine. Next man up. Guys got to be ready to play and last night you saw guys stepped up and was ready to play."
Love was in the midst of his best offensive season with the Cavaliers, averaging 20 points, 11.1 rebounds, 1.9 assists, and 0.9 steals.