knee replacement - still can do UT?

Hi all,

Maybe somebody asked this question before. I wasn't able to find one though. So please bear with me.
My mom had a knee replacesment a few years ago and she still suffers from knee pain and other illnesses. I thought that it would be great if she could do urine therapy. But I've heard that it is NOT okay to drink urine if one has steel in the body - like joint replacement or something.
Does anyone know about this?

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