Glossary

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.


O

Osteonecrosis of the jaw (ONJ)

Occurs when the jaw bone is exposed and begins to starve from a lack of blood. The bone begins to weaken and die, which usually, but not always, causes pain. ONJ is associated with cancer treatments (including radiation), infection, steroid use, or potent antiresorptive therapies that help prevent the loss of bone mass.

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Osteoporosis

Reduction in the quantity of bone or atrophy of skeletal tissue; an age-related disorder characterized by decreased bone mass and increased susceptibility to fractures.

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Outcome Measures in Rheumatology (OMERACT)

Group involved with the development and validation of clinical and imaging outcome measures in rheumatic diseases.

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