Thanks for your patience.
Radiosynovectomy is a procedure in which radionucleotides are injected into an arthritic joint (eg RA). The radionucleotides emit a type of ray which destroys inflammatory tissue such as synovium (the inner lining of a joint which produces the slippery synovial fluid). This procedure replaces surgical synovectomy (removal of the synovium) and is used after oral medicine fails.
Since this is considered nuclear medicine, a nuclear medicine faciltity should have information about the procedure.
Risk includes infection in the joint and increased swelling and
pain. (A good question to ask before having the procedure is "What is the chance of the radionucleotides destroying healthy tissue like cartiledge or ligaments?")
Check with your HMO provider for coverage. You will probably need to show that other treatments have failed. This procedure should be more cost effective than surgical synovectomy.
Let us know how things with your Mom turn out.