does anyone know how many knee replacements a person can have?

I was hit by a drunk driver and had my left knee replaced at age 45. After rigorous PT and 2 MUAs I had a partial revision, another MUA (with 3 days in hospital on CPM with an epidural) and then a total revision (different surgeons). Then I went on to have arthroscopic surgery to clear scar tissue and another MUA.
Still stuck, implant loosening. Went to another surgeon experienced in multiple revisions 2 hours away and went on to have 2 more total revisions on that same knee a year apart. Now the joint is unstable (my latest surgeon retired) and it's being recommended that I have the spacer sized up but I am consulting with Mayo Clinic because each surgery ends up in the same place- contracture 80 degrees flexion and -7-10 degrees extension. I am now 51 and can barely walk with my good leg starting to show signs of wear and tear because it's doing all of the work. I am so exhausted and trying to maintain some hope that I can resume a somewhat normal life again. I have brought up amputation as an option and no one has said "no" or even been surprised I would consider it. But I see amputees able to do way more than I can and it no longer seems extreme. Generally it's considered with chronic infection and as a last resort but in my case, I am hoping for a better outcome on the knee but I have a life to live. Perhaps it's not the worst thing.

Long story to say- I've had multiple total and partial revisions on the same knee in the span of 6 years and no one has said another cannot be done. The posts are long and getting them out will not be without significant risk of catastrophic breakage but at my age, I will need it done again someday and likely more than once. So I am hoping the technology is advanced at that point and I will be able to retain my leg AND have better function.