Hey man, sorry to be a debbie downer, but you have to put that desire in check. Safest on Femurs is 8 cm max, maybe 9 cm if you have very good genetics/age. 10 cm is really pushing it my dude.
We're going to need more details. But I would advise you to choose Birkholtz over Betz since Birkholtz is a ortho surgeon with experience and connections to trauma surg, but Betz/Becker is a plastic surgeon by trade, and is really only familiar with the betzbone; although I'm not sure Birkholtz uses the betzbone