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RA patients may have primary disease-related or glucocorticoid-induced osteoporosis.Current RA treatments do not simultaneously treat bone erosion and osteoporosis.Denosumab is effective against bone erosion and osteoporosis in RA patients.Three RA subgroups have been defined that can benefit from denosumab.Rheumatoid arthritis (RA), a chronic inflammatory disorder, causes swelling, bone erosion, and joint deformity. Bone erosion in RA-affected joints arises from activation of osteoclasts by inflammatory processes. RA patients may also have primary, disease-related, or glucocorticoid-induced osteoporosis, caused by a disrupted balance between osteoclasts and osteoblasts. Disease-modifying antirheumatic drugs (DMARDs) interfere with the processes causing inflammation in the joint but do not sufficiently treat bone erosion and osteoporosis. Denosumab, an inhibitor of receptor activator of nuclear factor κ-B ligand (RANKL), protects bones in osteoporosis patients. Clinical studies have demonstrated that denosumab can also prevent bone erosion in RA patients. Because joint destruction progresses in some patients treated with DMARDs alone, denosumab will likely become standard treatment for some RA patients.