Rheumatoid arthritis of the knee is a common disease, but suppurative arthritis caused by Gemella morbillorum in the same joint is rare. We report a case of suppurative arthritis caused by Gemella morbillorum in a patient with rheumatoid arthritis. Because the infection symptoms was not typical, the diagnosis was delayed, and the delayed diagnosis and therapy led to a poor outcome of the patient.%膝关节类风湿性关节炎比较常见,但受累关节出现麻疹孪生球菌所致的化脓性感染很少见.我们报道1例由麻疹孪生球菌导致膝关节类风湿性关节炎合并化脓性感染的病例.由于感染症状不典型,容易出现延误诊断.延迟诊断和基础病直接影响了治疗效果,值得我们注意.
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