The Boston Celtics announced on Thursday that forward Kristaps Porziņģis, 28, underwent surgery to repair a torn retinaculum and dislocated posterior tibialis tendon. The rare ankle injury, which he suffered during the NBA Finals, is expected to keep Porziņģis out 5-6 months.

The Celtics’ statement read: “The Boston Celtics announced today that center Kristaps Porzingis underwent successful surgery to repair a torn retinaculum and dislocated posterior tibialis tendon. Porzingis is expected to return to play in 5-6 months. Further updates will be provided as necessary.”

Porziņģis suffered the injury during Game 2 against the Dallas Mavericks after a collision with Mavericks center Dereck Lively II as they were boxing out during a free throw. Afterwards, Porziņģis limped up the court after the collision and was pulled from the game early. The team described the injury, which was separate from the calf injury that kept him out of the previous two rounds of the playoffs, as “rare.” Porziņģis missed Games 3 and 4 of the Finals before he returned in a limited capacity to play in the Celtics’ Game 5 clincher at home.

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