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Can I future-proof my knees?

Q I have a large cyst, about 7cm wide, at the back of my knee, which causes stiffness and pain. I am a 76-year-old woman in otherwise good health and formerly very active, but if I live as long as my 97-year-old mother did, two decades of limited activity poses a grim prospect for my health and weight. Is there a nonsurgical procedure that could remove it?