This is Dr. David
stem cell therapy or platelet rich plasma infusions into the knee often can help decrease inflammation and help with healing after injuries or with severe arthritis, but it is often not a long term solution
if you have severe degeneration wear down of the joint of your knee at age 80, most likely you will need a total knee replacement as a long term solution
but this is tough at your age of 80.
what you can do is try the stem cell therapy or the platelet rich plasma injections first and see how long that holds you for.
and try also steroid injections into the knee
you can read more about platelet rich plasma injections and stem cell therapy into the knee
the Mayo clinic has a special clinic which does this sort of regenerative medicine therapy for the knee
let me know if you have other questions.
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