The New York point guard had an MRI exam this week that revealed a small, chronic meniscus tear.
With the regular season ending April 26, the biggest story in basketball this season is probably done unless the Knicks make a deep playoff run.
He was barely holding on to a place in the NBA back in February. Now, after the back-to-back Sports Illustrated covers and popularity around the world, he has to go back to the bench when he wants to play most.
"If this was done very early in the year, obviously ... I don't know where my career would be. I could be, would be definitely without a job and probably fighting for a summer league spot," Lin said Saturday. "But having said that, this happening now hurts just as much, because all the players, we really put our heart and souls into the team and into season, and to not be there when it really matters most is hard."
The Knicks were under .500 and looking like a mess when Lin was given a chance to play extended minutes at point guard for then-coach Mike D'Antoni on Feb. 4 against New Jersey.
Lin, the first American-born player of Taiwanese or Chinese descent to play in the NBA, scored 25 points with seven assists in that New York victory, was inserted into the starting lineup two days later against Utah, and took the Knicks on a seven-game winning streak that gained world-wide attention.
Lin left the Knicks' easy victory over Detroit last Saturday, saying afterward he could have returned for the fourth quarter if the game had been close. He took part in shootaround before their game Monday and believed he could deal with the pain.
Though the swelling went down, the pain never did, and after testing it again Friday and Saturday, he decided to have the surgery.