Sorry your knee is still giving you problems, Cat!   Best wishes for a speedy recovery.
You could get some super-glue and semi-precious stones like the ones sold in magick shops (tumbled amethyst, quartz, malachite, etc.) these are not too expensive and would look nice...

Liz: I hope you get the procedure you need soon! In this country you'd not only have to wait bu pay through thenose for it, even if insured (which I am not so dont ask)