Do you really mean a hip replacement or are you euphemistically referring to a procedure such as a Birmingham resurfacing?
In any event, here is a Class 1 medical holder who has had just such a replacement. As those who were at the recent Gatbash will tell you, such an operation has made no difference to the incisiveness of the mind nor the beauty and various talents of the body in question.
Mind you though, lesser mortals might find the operation just a trifle daunting.
Always open to pms on the subject because, in all seriousness for a moment here, it is a big operation and it does have an element of the irreversible about it.