Looking for rheumatic disease types, treatments, and associated rheumatology definitions? From abatacept to WOMAC, learn about common terms related to arthritis and rheumatic and musculoskeletal diseases. Looking for information about MACRA? See MACRA terms and definitions.



Family of protein-hydrolyzing endopeptidases that contain zinc ions as part of the active structure.

Methotrexate (Rheumatrex, Trexall, Otrexup, Rasuvo)

Folic acid antagonist used as an antineoplastic agent; used to treat psoriasis and rheumatoid arthritis.

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Morning stiffness

Joint stiffness upon rising in the morning; one of the most common symptoms of rheumatoid arthritis (RA). Morning stiffness that lasts at least an hour is considered a key diagnostic aspect of RA.


Death rate.

Mycophenolate (Mofetil) (CellCept)

Indicated for the prophylaxis of organ rejection in patients receiving allogeneic renal, cardiac, or hepatic transplants, and should be used concomitantly with cyclosporine and corticosteroids. Has been used to treat people with lupus, rheumatoid arthritis, vasculitis, inflammatory bowel disease such as Crohn’s disease, inflammatory eye disease (such as uveitis (iritis) and scleritis), and some other kidney or skin disorders.


Any abnormal condition or disease of the muscular tissue; commonly designates a disorder involving skeletal muscle.


Inflammation of a muscle.

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