Fortunately, few know exactly what Celtics superstar Jayson Tatum is going through after rupturing his Achilles tendon in Game 4 of the East semifinals against the Knicks. One member of the Red Sox does.

The Boston Celtics’ NBA title defense is hanging by a thread, but their biggest concern is the health of star forward Jayson Tatum, who had to be helped off the Madison Square Garden court after suffering an apparent noncontact leg injury during a 121-113 loss to the New York Knicks in Game 4 of the Eastern Conference semifinals Monday.

Boston Celtics forward Jayson Tatum will miss the rest of the season after tearing his Achilles tendon. The team announced Tuesday that Tatum had surgery to repair the injury. Tatum, 27, was hurt in the fourth quarter of Monday’s game four playoff loss to the New York Knicks.