The Islanders avoided a disaster scenario after first-round pick Kashawn Aitcheson left Sunday’s preseason game following an open-ice hit from Noah Juulsen late in the second period.

Juulsen flew into Aitcheson, whose head was down as he was playing the puck forward, and appeared to connect knee on knee, sending the Islanders defenseman down in a heap.

Aitcheson immediately signaled for trainers and was helped off the ice without putting any weight on his left leg as Tony DeAngelo got into it with Juulsen.

Aitcheson did not return to the game, but coach Patrick Roy said afterward the defenseman avoided any serious injury.

“He’s fine,” Roy said after the 3-2 shootout loss to the Flyers. “He’s gonna be day to day. It’s a lower body [injury], so he’ll be fine.”

DeAngelo, who was paired w

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