Badminton star Saina Nehwal has undergonea knee surgery on Saturday. Saina underwent the surgery at Mumbai's Kokilaben Dhirubhai Ambani Hospital (KDAH). She is likely to be out of action for four months, her father Harvir Singh said on Saturday. He said doctors who performed the procedure, have advised her rest for three to four months. "We have requested them (the doctors of Kokilaben Dhirubhai Ambani Hospital) to allow us to go to Hyderabad (her hometown) so that we can do it (medical follow-up) there. Otherwise she cannot move for four months at all", her father said. He also added that it's really a big setback for her. and that it depends on how fast she recovers from the surgery.

"She had sustained an intra-articular (inside the joint) injury to her right knee. A small fragment of bone had separated from her knee cap bone (patella). This displaced fragment was causing her impingement and pain," KDAH Executive Director Ram Narain told reporters. "After the surgery," Saina, 26, tweeted and posted a rosy, cheerful smiley, indicating her present condition after she was shifted to her room. Sachin Tendulkar also wished her a speedy recovery with a tweet which read, "Wish you a speedy recovery from the knee surgery. Phase of injury in a career is difficult but you have always been a fighter!"