I considered a knee replacement because of my injury but was told by a doctor that joint replacements are an absolute last resort as they only really give around 50% (of normal) benefit so generally only people down to around 20% or so tend to get them in order to come UP to 50%. Since I'm around 90%, I'd actually be going backwards.
No pain though, which would be nice.
Plus, apparently, they need to be replaced every few years. Having major surgery every few years is incredibly unappealing.
Anyway, anything that could improve these factors is a good thing. Then again, I'm hoping stem cell research will lead to far better alternatives.