New Delhi, March 22 - Bollywood actor Arjun Rampal injured his knee while shooting a song for Karan Johar's yet-to-be titled film, which is an adaptation of Chris Columbus' 1998 comedy drama 'Stepmom'.

'...had a blast at the 'Stepmom' shoot, it's a great song, full on rock and roll number. Banged my knee badly while doing this sliding step on the floor, hope it just a bruise and passes. (I) hate injuries, they are very annoying and come in the way of work,' Arjun posted on his Twitter page.

The actor was shooting the song with Kareena and Kajol for the movie, being directed by Siddharth Malhotra.