My mother had a hip replacement last summer - she fell and broke her hip so there was no choice but to have surgery. I had heard about the possibility of serious deterioration after hospital stays/general anaesthetic so expected the worst, but actually I don't think it made any difference to my mother. She was very sleepy and confused for the first four or five days but then seemed to be okay, ten days later she returned to the care home and was 'back to normal'. She is late mid-stage and has deteriorated over the past year, but gradually, not suddenly after the surgery.