Could be "extensor carpi radialis" - a measure of one's ability to stretch the hands = joint flexibility

Osteoarthritis and rheumatoid arthritis are quite different things but share many signs and symptoms including pain and inflammation. RA is considered an autoimmune disease while osteoarthritis may be 'wear and tear' on joints or injury but isn't a disease of the whole body. Their treatments are quite different: RA needs very powerful medications like methotrexate, gold and many others. OA needs joint replacement if inflammation and pain control is not enough.

I certainly have reason to be grateful that hip replacement for my OA has given me the best year of the last 15. I can finally walk again without pain.

However, extra anti-oxidants would be a great idea for most people. That is SO GREAT, Nat, that your mother is getting better. Fingers will definitely be crossed for her complete remission. What a wonder that such a simple treatment can have such wonderful effects.