New Orleans' reserve forward Ryan Anderson was taken from the court on a stretcher after colliding with Boston's Gerald Wallace in the fourth quarter on Friday night.
The Celtics said a preliminary diagnosis indicated a "cervical stinger."
Anderson and Wallace collided near the Celtics' basket with 11:02 to play. They both went to the floor hard.
Anderson remained on his back as he was being checked by the team's trainer and a Celtics' doctor before a stretcher was requested.
After about a 5-minute delay, he was put in a back brace and then on a stretcher before being wheeled off to applause from the TD Garden crowd. Both teams came out and surrounded him when the stretcher was brought out.
Anderson had 13 points and seven rebounds before leaving.