I'm having some short-term surprising success with HLA (I think they call it "viscoelec") injections -- I recently got 3 injections in each knee in total, 1 week apart for each injection. It adds extra liquid cushioning in the knee joint. But I think there are higher grades of the injectable HLA - I see ads on line for at least 3 other types that the mfr claims will last longer. My ortho doctor said the other HLA injectable types would not be covered by insurance. I have Scan HMO Medicare. Well, I don't care about the cost if the injection(s) last longer, like several months' duration. I just had my arthroscopic surgery on my left knee in April 2025. They could not repair the cartilage/meniscus as well as I'd like, so I have a spot that is bone on bone and can be very painful. Walking at times can be very painful, and I live on Tylenol. My messed up back adds to that pain. I don't know what a "partial" knee replacement would do for me, because I don't know the details of what tissue/bone cutting they do. All the ortho doctors just let TKR roll off their tongue and don't want to consider something different and less invasive than a TKR.