Kevin Knox returned to action for the Knicks without missing any time after spraining his ankle Sunday and Dennis Smith Jr. played for the first time in more than two weeks after suffering a back injury.

Neither provided a spark and the Raptors didn’t even need their resting superstar Kawhi Leonard, punishing the frigid Knicks from the get-go in a 117-92 rout Thursday at the Garden.

The Knicks’ league-worst record dropped to 14-61 as they fell to 0-4 on their six-game homestand-from-hell. All four losses were by at least 20 points.

Knicks coach David Fizdale wasn’t happy. When asked how he remains positive after another blowout, Fizdale snapped: “It doesn’t have to be positive. It won’t be positive [Friday] in the film session.’’

There was one positive. Rookie center Mitchell Robinson was oh-so-close to a 20-20 game. He finished with 19 points and 21 rebounds, missing two late free throws that kept him from a landmark line. Playing at his active best with alley-oop dunks and putbacks, Robinson still became the first Knicks rookie to log a 19-and-21 ledger since Willis Reed in 1965.

“My arms were tired,’’ Robinson said. “DJ [DeAndre Jordan] kept putting it in my ear. I knew how close I was.”

Enough of the positives. To start the game, the Knicks were ice cold — 4-of-17 while the Raptors were getting out on the fast break and hitting their 3-pointers. Following a Kyle Lowry corner 3, the Raptors had grabbed a 19-10 lead after five minutes, forcing Fizdale into his first timeout.

This wasn’t Knox’s night — he scored nine points on 3-for-10 shooting with two turnovers. After Knox lost the ball on a drive in the third quarter, Long Island’s Danny Green fed Pascal Siakam for an alley-oop dunk.

Coming off the bench, Smith made his return from a six-game absence with a disk issue and looked rusty, with seven points on 2-for-11 shooting, one assist and two turnovers.

The Raptors were led by Most Improved Player of the Year candidate Siakam, who scored 31 points.

The Knicks trailed 55-36 at intermission. The biggest first-half stat differential was the Knicks shooting 1-for-13 from 3-point range while Toronto hit 12-of-26 for a 47 percent clip. The Knicks finished 6-for-26 from deep.

Before the game, Fizdale admitted Smith still wasn’t 100 percent.

“The back is still sore,’’ Fizdale said. “But he wants to go. Just want to get him where at least we can get in six, seven games at least and get him back feeling good about himself and playing well. The more minutes he can play with these guys the better. It’s all chemistry.’’

As far as free agency and landing players that play the same position as the team’s incumbents, Fizdale said he’s trying to create a “positionless’’ roster. It was noted Kevin Durant plays the same position as, say, Knox.

“That I’m trying to do with all of them is make them, to a certain extent, positionless,’’ Fizdale said. “Where it doesn’t matter who they’re out there with. That their skill set applies to whatever position they’re playing. That’s kind of how we’re looking at it going forward.”