Rheumatoid arthritis (RA) is a chronic joint disease characterized by hyperplasia of synovium, excessive infiltration of mononuclear cells, and extensive destruction of the articular cartilage.

• 类风湿性关节炎是一种慢性的关节疾病，其特徵为关节内有大量增生的滑膜组织，单核球的浸润以及关节软骨的破坏。