I have quite a narrow jaw so am interested in the potential of hydroxy along the jawline (I know it has a multitude of uses). But when I spoke to a surgeon today, he pretty much said that, if you want a wider jaw, you have two options: option A - orthognathic surgery - but the difference to the width of the face is negligible. Or option B - jaw implants - the only thing that will give you a chiselled jawline.
His reason for being dismissive about hydroxy was that it could crumble and implants actually provided more stability as well as definition. I just wonder though how much of his opinion was coloured by the technical difficulty of applying the hydroxy to the jawline (which he mentioned), and so rather than go through the ballache of applying it when the results are quite subtle, he'd rather use implants. That's me just speculating though. He was also dismissive about fat transfer.
Hopefully, distraction of the ramus (whatever it is) can be developed in the future to produce solid results otherwise, I think there's few options available to augment the jawline, but I'm still 50/50 about the use of hydroxyapatite.
I'm probably not as well read as others on the subject so please let me know if I've forgotten any other options to enhance the jawline (not including the chin).