Welcome to Year 2 of Joakim Noah’s infamous Knicks tenure: uncertain when he will be in uniform, grateful for any minutes at all.

With starting center Enes Kanter again sidelined by back spasms, Noah was on the active roster and played Monday night for the first time in the second season of his albatross four-year, $72 million contract as the Knicks fell to the Trail Blazers, 103-91, at the Garden.

It wasn’t much. Three minutes. But even three minutes, the 32-year-old’s first since February, clearly meant a lot.

“Oh my god, it’s been so long,” Noah said. “Just to be on the court is special. … Playing in the Garden is something I’ll never take for granted.”

Noah checked in to a smattering of applause in the second quarter. He quickly blocked a shot at the rim and later leaped for a defensive rebound. He scored a running righty layup. He took an unnecessary foul and checked back out, to even more cheers.

“For not playing in a while, we wanted to get him out there and use that energy,” coach Jeff Hornacek said.

Noah is a de facto fourth on the depth chart at center behind Kanter, Monday’s starter Kyle O’Quinn and sidetracked sophomore Willy Hernangomez. More than that, Noah has been something of a forgotten man, a very expensive vestige of the Phil Jackson era of Knicks (mis)management.