Maybe they will do that for my knees.
They do use gel on people's knees. You should ask about it. I haven't had it done yet because the cortisone shots I get in them once a year have worked so far. I have bone on bone in my knees. They told me I'd probably need knee replacements in both, and I told them hopefully I'll be dead before then.
I feel the worse when I get up in the morning. Joints and back are all stiff, and it takes a while for me to get my sea legs. Once I'm up for a while, I'm able to move around a lot better, but then I go to bed and getting up starts the cycle all over again.