Lakers officials said X-rays were negative and further tests will be done Sunday in New York. The Lakers play the Knicks on Monday night.
The injury occurred at about the 7-minute mark of the first quarter under the Lakers' basket. Kobe Bryant drove to the basket, missed the shot and crashed into Bynum's right leg. Bynum immediately grabbed his knee.
The two were on the ground under their basket as the Grizzlies went to the other end. After Los Angeles gained possession, they called time out. Bynum was helped to the locker room with Los Angeles leading 13-11.
Bynum missed the final 46 games of last season with a left knee injury he suffered against Memphis on Jan. 13, 2008.