The injury took place in the third quarter, and Rondo was ruled out for the rest of the game. Rondo hyperextended his left knee. In January 2013, he tore the anterior cruciate ligament in his right knee.
"It's not the worst thing that could have happened, so I'm fine," Rondo said.
"I got looked at by the doctor and it wasn't what I thought it was," Rondo said. "I just wanted to make sure it wasn't the same [as his previous knee injury]."
The Mavericks acquired Rondo in a December trade with the Boston Celtics. In 42 games with Dallas, he has averaged 9.1 points, 6.5 assists and 4.5 rebounds in 28.7 minutes per game.
The Mavericks (46-31), which currently own the No. 7 seed in the Western Conference, host the Phoenix Suns on Wednesday.