Honestly, I did it to avoid TKR. My physical therapist told me about the GAE study, and I qualified. My other understanding is if one gets GAE, then they're still able to get TKR...but if one has had a TKR they wouldn't be eligible for GAE. Of course, I may have misunderstood. I know a few people, directly and indirectly, that indicated the TKR wasn't worth it. Anyway, for me, so far, so good.