uncemented hip issue?

Do you mean this sentence "bony ingrowth can be interrupted for a variety of reasons including movement of the implants before bony ingrowth is established"?

Because there was more to it regarding the reasons for failure of bony ingrowth "inaccurate fit between the implant and the bone, presence of debris, blood and fat which can obstruct the bony ingrowth" meaning this is rather more an issue about the surgeon's technique than anything the patient does or doesn't do.

However, there was also this comment "some surgeons require the patient to be non-weight bearing for some weeks after surgery in order to avoid interruption of the bony ingrowth" but considering there are more and more surgeons who don't subscribe to this, it would seem to be something of a misnomer.

Point is assuming the prosthesis is properly fitted, bony ingrowth will occur quite satisfactorily and there is no need to take supplements or anything like that. I wouldn't worry about it, okay?

It's actually not odd at all! Every surgeon is a composite of his training which will be totally unique for each man (or woman!). Add to that his own research and opinions, and his own experiences, and you get the vast variations in treatment and procedure. And as I often used to tell my theatre staff, a surgeon who does something different isn't necessarily wrong, he's just ..... different!