I would like to know about the prostheis

Would anyone care to tell me a bit about the different kinds of prosthetic legs?  BKAI'm working with some guy that comes to my house because he doesn't have an office, just a shop.  Oh, and he's only in my town a day or two a week.  That alone makes me wary.  But, he's about the only one who will accept my lousy insurance (Physician's Health Choice), a medicare supplement. All he's told me is about a leg that works off some sort of pump mechanism and that it's not the kind he's going to make for me.  No, I'm not kidding.What should I expect people?  I'm really worried.  I'm a large girl and need a heavy duty leg that's not going to fall apart on me.  Should I make any special requests?  I have no idea what I'm doing or what to expect.Help!