The 26-year-old's left leg folded beneath him as he landed badly during the men's qualification event.
Said, who won gold on the rings at the 2013 European Championships, was taken off on a stretcher and acknowledged the crowd as he departed.
French team leader Corrine Moustard-Callon said: "We don't know what happened, except it was his tibia."
She added: "He is in the hospital with a doctor now. We will do more exams to see if it is just the bone.
