The Knicks are going to find out, again, what life is like without Mitchell Robinson, their defensive anchor.

The standout center will miss the next 8-to-10 weeks after undergoing surgery on his injured left ankle, the team announced on Monday.

Robinson suffered the injury in Friday’s loss to the Celtics.

It is a major blow to coach Tom Thibodeau’s team.

Robinson, 25, is the key to the Knicks’ defense and one of the premier offensive rebounders in the league.

The only saving grace is the Knicks are deep at his position, with Isaiah Hartenstein and Jericho Sims able to fill in. Neither, however, is Robinson.

The 7-footer is averaging 6.2 points, a career-high 10.3 rebounds and 1.3 blocks in 29.2 minutes per game.