An NYPD officer working a paid security detail at Madison Square Garden was left with what he describes as permanent spinal injuries after being attacked during a confrontation involving rapper Lil Tjay, according to a newly filed lawsuit.

Officer John Przybyszewski was assigned to provide security at a boxing match held at MSG’s Hulu Theater when the Bronx-born rapper, whose real name is Tione Jayden Merritt, allegedly became aggressive and sparked a physical altercation alongside members of his entourage and bodyguards, court documents filed Monday state.

“This didn’t just injure me physically — it completely altered my life,” Przybyszewski told The Post, saying he now lives with constant neck and back pain.

The lawsuit claims that during the lightweight title fight between Keyshawn Davis and Denys Berinchyk last February, Merritt grew “volatile and confrontational” toward arena staff and other attendees. MSG officials then directed the off-duty officer to escort the rapper out of the venue.

Przybyszewski, one of only two paid-detail officers on site — allegedly far fewer than required — reportedly approached Merritt calmly and asked him to leave. Instead, the rapper allegedly began shouting, shoved the officer backward, and was joined by members of his entourage, who knocked him to the ground.

According to the suit, multiple individuals fell on top of the officer, leaving him in extreme pain. At some point during the chaos, Merritt — who has reportedly been permanently banned from Madison Square Garden — also allegedly spat at an MSG employee, an incident supported by video evidence cited in the filing.

Przybyszewski was taken to NYU Tisch Hospital, where doctors diagnosed him with serious cervical spine injuries, including damage to two lumbar discs, court papers say.

“I love being a police officer, but this injury robbed me of certainty about my future,” said Przybyszewski, who joined the NYPD in 2018. “I may never know how far my career could have gone or what my true potential was.”

The lawsuit argues that the officer’s permanent injuries were the direct result of severe understaffing. It accuses the event promoter and Madison Square Garden of negligence and alleges assault and battery against Merritt.

According to the complaint, MSG knowingly understaffed the packed boxing event, deploying only two security officers despite an internal assessment calling for at least eight, creating what the lawsuit describes as a chaotic and uncontrollable situation.

Przybyszewski also said he filed a complaint with the Manhattan District Attorney’s Office, but prosecutors have since declined to pursue the case. The DA’s office did not respond to requests for comment.