Our sources close to Hrithik reveal; he is doing it for his upcoming Sanjay Leela Bhansali film Guzaarish, also starring Aishwarya Rai.
He further reveals, "Hrithik plays a paraplegic patient in Sanjay Leela Bhansali's Guzaarish. He is shown confined to a wheelchair mostly in the film with Aishwarya Rai
playing nurse to him. Now to bring more perfection to his act, he has begun visiting a suburban Mumbai hospital almost every day to observe paraplegic patients.
He mostly goes in during the early morning times when the hospital is less crowded and before the visitors start coming in. He has even started interacting with the patients there."
Incidentally, Hrithik plays a radio jockey named Ethan in the film before he turns paraplegic, so we won't be surprised if he starts visiting radio stations for the same soon