At about 07:10 PST, a passenger sustained a fractured hip on America West Airlines Flight 5 while en route from Tampa, Fla., to Las Vegas. The aircraft was in cruise flight at flight level 310 when it encountered light to moderate turbulence. The seat belt sign was illuminated and several announcements had been made for the passengers to remain seated with their seat belts fastened. A 70-year-old male passenger got up and began walking toward the aft lavatory. One cabin attendant told the passenger to return to his seat. The passenger, who has two artificial legs, ignored the cabin attendants instruction and continued to the aft galley area where he fell, fracturing his hip. The crew obtained medical advice by radio and the aircraft continued to its destination.