X-Ray Findings. Early singns are soft tissue swelling, osteoporosis around the involved joint, and erosion of the peripheral "bare space" of bone surface that is not covered by cartilage. Later, extensive erosion of cartilage causes joint space narrowing. Bony cystes result from invasion by granulation tissue. Rheumatoid synovial may invade the joint capsule, ligaments, and tendons, and it may add to joint instability include by destruction of cartilage and bone. After some years, the degenerative changes of secondary osteoarthritis may be superimposed.
Special attention should be directed to the upper cervical spine and especially to C1-2, where subluxation may result in the development of serious neurologic complications.

X光调查结果。 早的 singns 是软的薄纱织品膨胀, 骨质疏松症在有关的关节周围, 和骨头不是被软骨复盖的表面外围设备 " 赤裸的空间 " 的腐蚀。 稍后，软骨的广泛腐蚀引起关节空间变窄。 如骨的 cystes 起因于使成粒状薄的纱织品的侵犯。 风湿性的 synovial 可能侵入联合的胶囊，结带和腱，而且它可能增加连接不安定藉着软骨和骨头的破坏包括。 在数年之后，中级骨关节炎的退步变化可能被重叠。
特别的注意应该指向上面的颈背骨而且尤其到 C1-2 ，次脱臼可能哪里造成严重 neurologic 复杂化的发展。

大慨是这个意思了！