Rheumatoid arthritis (RA) is typically represented as synovitis and bone erosions of small joints. This classic picture resulted from comparing patients with RA with other rheumatic joint diseases for clinical and radiographic characteristics. Although different classification criteria for RA have been developed over time, this classic picture has not changed since the mid-20th century. During the last decennium, advanced imaging modalities, such as MRI and musculoskeletal ultrasound (US), have refined our understanding of tissues involved in RA. We will argue that tenosynovitis at the level of the hand and feet joints is a feature that deserves to be added as the third classic trait of RA. A feature can be considered as a disease trait when it occurs frequently and is specific, and when a new trait is considered its connection with the disease is not a substitute of an already acknowledged classic feature. We will study the occurrence of tenosynovitis in RA in the light of these principles. Many, but not all, tendons at the hand and feet joints are surrounded by a sheath.1 2 Tendon sheaths have a cell composition …

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不仅需要考虑滑膜炎，还需要考虑腱鞘炎：为什么是时候更新类风湿性关节炎的教科书图像了


类风湿性关节炎（RA）通常表现为滑膜炎和小关节骨侵蚀。这张经典图片是通过比较 RA 患者与其他风湿性关节疾病的临床和放射学特征而得出的。尽管随着时间的推移，已经制定了不同的 RA 分类标准，但这一经典图景自 20 世纪中叶以来一直没有改变。在过去的十年中，先进的成像方式，例如 MRI 和肌肉骨骼超声（美国），加深了我们对 RA 相关组织的了解。我们认为，手足关节水平的腱鞘炎是一个值得添加为 RA 第三个经典特征的特征。当一个特征频繁出现且具有特定性时，可以将其视为疾病特征；而当一个新特征被认为与疾病的联系不能替代已公认的经典特征时，则可以将其视为疾病特征。我们将根据这些原则来研究 RA 腱鞘炎的发生。手脚关节处的许多（但不是全部）肌腱都被鞘包围。1 2 腱鞘具有细胞成分……