My sister and I have one fundamental tenet of medical care--once you cut something, it is never the same. Tissue is gooey, frangible--a second surgery in the same area adds to scar tissue, misplacement of structures, and so on.
Of course, "never the same" CAN mean less painful, more functional--but it doesn't always.
Implants can "loosen." Some artificial joints can break--from a fall, say. They can dislocate. In some awful cases, they can develop a long-term infection. Or the device can be recalled.
Joint revision surgery is much more complicated than the original.
Patients with a "bionic" part should avoid overusing the joint. This means maybe not run or play tennis.
Avoid "jumping" sports--trampoline, basketball.
Maintain a healthy weight.
And--always--find a doctor who does a lot of the procedure you want done.
If you get a bacterial infection elsewhere, ask your doctor about it getting into the joint.
Sudden pain the joint? Sudden trouble getting up or around? Call the doc!
I admit to being a baby--but 4 surgeries on my detached retina resulting in a blind right eye has not resulted in my wanting knee replacement. Sure, they say it's great. But people say a lot.