Chennai, December 4 : Superstar Rajinikanth suffered a minor injury on the sets of his upcoming Tamil science-fiction action-thriller "2.o" here. According to a source, he fell and hurt one of his knees.The incident occurred on late Saturday evening."Rajinikanth fell while filming a crucial scene and hurt one of his knees. He was taken to Chettinad hospital where the superstar underwent treatment for about half an hour. Later, he returned home," a source from the film s unit told Media.Multiple sources have confirmed the superstar is absolutely fine.In a video released by Rajinikanth s manager Riaz K. Ahmed on his Twitter page, he is seen exiting his caravan, waving at fans and then entering his car.Directed by Shankar, the film is being made on a lavish budget of Rs 400 crore.It also stars Akshay Kumar, Amy Jackson, Sudhanshu Pandey and Adil Hussain in important roles.