In reply to EricH: I did my lower leg (Tibbia, Fibula and dislocated abkle)a few years back and ended up with a plate. It's not too noticeable when looking at the skin (other than the scar) but is definitly there when you run a hand over it (or a German airport metal detector!).
At first (year one) its restrictive nature, muscle regrowth and reduced flexibility kept me away from many sports, but since then I have skied, biked, run, swum and climbed harder than I did before.
I may not achieve the levels of these sports I might like, but I don't think that the plate is the reason I won't get there.
I may be lucky since I don't need special adjustments to equipment to cope with it, those kind of adjustments come from other requirements.
In short, my plate hasn't held me back once I got used to it.