Amitabh Bachchan revealed that he injured his knee after slipping and falling on the set of Kaun Banega Crorepati 18. In a monologue on a recent episode, the 83-year-old movie icon appeared seated, saying that standing was difficult after the injury. Bachchan reassured viewers there was nothing to worry about, but his claim has shone a spotlight on how falls can affect the knees, especially as people grow older. A fall at any age may lead to anything from temporary bruising to a more serious injury, but changes to the bones, muscles, cartilage and other joint structures can affect the body’s response to these accidents.