Mumbai: Actor Arjun Rampal injured his knee while filming a scene for the upcoming suspense thriller film "Kahaani 2", which also stars Vidya Balan. Arjun was filming a chase sequence, when he "busted" his knee. He also shared a photograph of his injury on Twitter. "Busted my knee today, while filming a chase sequence. Finished the shoot. Now in agony. But then no pain no gain. 'Kahaani 2'," Arjun tweeted on Tuesday night. Directed by Sujoy Ghosh, “Kahaani 2” is a sequel to "Kahaani", which revolved around a pregnant woman named Vidya Bagchi, who comes to Kolkata from London in search of a man. The 2012 film also featured Parambrata Chatterjee, Nawazuddin Siddiqui, Indraneil Sengupta, Dhritiman Chatterjee and Saswata Chatterjee among others. "Kahaani 2" is set to release on November 25.