That's what my new arm is, myomer. Artificial fibers, steel that behaves like muscle. Trying to graft that onto my leg? It'd be like... okay, imagine a hole in the wall. You fix it with spackle, not entirely new studs and drywall and wiring and all that. Otherwise you'd have to tear down more than you'd fix. To replace the damaged muscle in my leg with myomer would mean weaving it all the way up into my abdominals and lower back - and I've seen how that's done, and I want to avoid it if at all possible. My arm feels weird enough now as it is.