Frustrated Porzingis may end season injured — again

Kristaps Porzingis may end his second season as he did his first one — injured. But unlike a spectacular rookie campaign, the 7foot-3 Latvian’s sophomore year ends with more concern than boundless hope that he is destined as a future top-three superstars.

Porzingis could miss his fourth straight game with back spasms when the Knicks host the Raptors on Sunday in a noon matinee. There is just one game left after Sunday — Wednesday against the 76ers. As the sixth-worst Knicks jostle for a better lottery seed, it might be wise to let him sit, though Porzingis is anxious to get back on the court to go into summer with a more positive frame of mind.

“I didn’t finish the season last year, so I want to at least finish these last couple of games. It’s not smart to force it now, you have to be smart about it. But I would like to play,” Porzingis said.

Porzingis, 21, already won’t reach the number of games he logged last season. He has suited up for 66 games, after a rookie season in which he played 72.

Durability is now an issue. Last season he missed the final six games with a sore shoulder.

Porzingis wove a sensational November before cooling down in mid-December.

He blamed his Achilles tendinitis — which first surfaced on Christmas — as the cause to a year that didn’t live up to giant expectations.

“Until I got hurt with the Achilles, I was playing a very high level, very consistently, every night, but still we weren’t playing at the level that we wanted to as a team, so that didn’t really do anything for me,’’ Porzingis said. “But I liked the consistency. I was out there playing at a high level. Then the injuries, little things [that] happened got me out of my rhythm. Then it was kind of on and off, some games good, some games not so good. I was trying to find that rhythm for a long time. Then the second part of the season, it was just a big fight for us and mentally tough. I think I grew from this season.’’

Besides his fragility, Porzingis didn’t make strides as a beastly low-post performer — key in the triangle — or as a penetrator. He became too one-dimen- sional as a jump shooter. He also wasn’t the menacing shotblocker he was as a rookie.

“Getting stronger — that’s going to be a major key for me,’’ said Porzingis, who may play for Latvia in the European Championships. “And staying low — offensively and defensively. It’s going to be leg strength. Driving to the hoop is going to be big for me. I’m going to work so hard this summer. It’s going to be a huge summer for me.”