Arenas drove hard to the basket and fell hard to the court after being called for a charge Wednesday night. He was helped up by teammates, but had a noticeable limp when he headed to the bench.
Trainers did not work on him and he remained on the bench with a heat pad on his upper left leg. He seemed in good spirits, cheering without standing when Randy Foye hit a 3-pointer moments later. The team said his return was questionable.
Arenas, who had 18 points before he was hurt, missed all but two games last season after three knee operations in 1 1/2 years.