Suggest Treatment For Difficulty In Walking With Back Pain

Doctor, it seems like my sister is having problems walking, she is always limping, always complaining of back pain, and is having problem when she has to walk for a long distance. Just recently she has seen a doctor who simply diagnoses from the x-ray that she needs to change her hip bones. May I ask for your opinions and perhaps some comments.

Her age is 55 years old, height is 1.60 meter tall, and her weight is 59 kilos. She has no previous medical problems.