YAS ISLAND, ABU DHABI — For all of the planning how the Knicks will play, what the lineup will look like, it still rests on the unknown that already has reared its ugly head — health.

The first test showed flashes of what the Knicks have imagined the team can be with an easy 99-84 win over the Philadelphia 76ers at Etihad Arena . But before their preseason debut began Thursday, OG Anunoby was ruled out with a sprained left hand. After playing only seven minutes, Josh Hart suffered what appeared to be a back injury — although he was ejected from the game on the play, so his injury status was unclear.

Just 1:31 into the second quarter, Hart collapsed to the floor, grimacing in pain after grabbing a rebound and turning to push the ball upcourt. He immediately was on his back in pain w

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