Jayson Tatum tore Achilles in Game 4 loss to Knicks, underwent season-ending surgery, Celtics say

The New York Knicks beat the Boston Celtics, 121-113, in Game 4 of the Eastern Conference semifinals and are now up 3-1. Colin Cowherd discusses whether the series is over.

The Boston Celtics entered this year's NBA playoffs with the top seed in the Eastern Conference. But the Celtics will have to overcome a 3-1 series deficit if the team is to keep hopes of defending its NBA title alive.

The New York Knicks' 121-113 victory on Monday night pushed the reigning champions to the brink of elimination. But much of the postgame discussion centered around the health of Celtics star Jayson Tatum. 

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Boston Celtics forward Jayson Tatum is helped off the court on Monday. (Vincent Carchietta-Imagn Images)

The six-time NBA All-Star fell to the Madison Square Garden hardwood with just under three minutes remaining in Game 4. 

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Speculation quickly began to swirl that Tatum had injured his Achilles.

On Tuesday, the Celtics confirmed the star forward ruptured his right Achilles tendon. The team also announced that Tatum underwent a medical procedure to repair the torn tendon.

Jayson Tatum receives attention after being injured. (Elsa/Getty Images)

The Celtics described Tatum's surgery as "successful," but cautioned that there is currently "no timetable" for his return. The 27-year-old is expected to make a full recovery, per the Celtics.

Tatum lunged toward the ball as he tried to regain possession for the Celtics at the 2:58 mark in the fourth quarter. He then appeared to experience a serious issue with his right leg, before immediately calling a timeout. 

New York Knicks forward OG Anunoby chases the ball as