@lev4735
I have not seen any studies that discussed those types of problems putting in the spacer. I have never heard of anybody complain about having a problem having the spacer put in. There is apparently a very rare chance of a problem

I have attended weekly Advanced prostate cancer meetings for years And participated in more than one form like this.

Do a web search using this and see what you find
“Is there any risk to putting in spacers like SpaceOAR, Barrigel, or BioProtect for prostate cancer radiation”