It turns out this was not a completely new injury. Anthony told reporters after the game that his knee had been bothering him for several weeks now. He complained about pain, soreness and some stiffness in the knee. There are no tests planned for the knee and the team said they will re-evaluate it tomorrow.
Carmelo Anthony even said he underwent an MRI "a couple of days ago." He went out and tried to loosen it up, but he realized pretty quickly he would hinder the team with the injury and left the game. The Knicks won despite the loss of Anthony, who is tied with Kevin Durant for the NBA scoring title. New York beat Cleveland, 102-97.
When Anthony left the game in the first quarter, he had no limp, but was ruled out a few minutes later. He remains questionable for Wednesday's game with the Detroit Pistons. In 49 games this season, Anthony is averaging 28.6-points-per-game. The New York Knicks are 36-21 on the season and sit in third place in the Eastern Conference.