Robinson committed an intentional foul on Kobe Bryant with 8:21 remaining in the second frame, then hopped directly to the locker room with team trainer Ed Lacerte in pursuit. The Celtics said he would be evaluated at halftime and, at the start of the third quarter, he was deemed out for the night.
Robinson is expected to have an MRI on Friday.
Robinson's injury left the Celtics with nine available players and thinned an already depleted bench. Couple with foul trouble for the night's 3-point hero, Ray Allen, the Celtics leaned heavy on Von Wafer as a key backup guard.