Pathological features of established osteoarthritis with hydrathrosis are similar to rheumatoid arthritis

Objectives The prevalence of rheumatoid arthritis (RA) and knee osteoarthritis (OA) is increasing with our aging society. Some reports suggest that OA with effusion synovitis develops into RA and early OA patients with effusion are pathologically similar to those with RA. The purpose of this study w...

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