The pathology change of rigidity sex rachitis is in inchoate with rheumatoid arthritis very similar, the synovitis that is a characteristic with organization of proliferous sex granulation begins.

• 强直性脊柱炎的病理变化在早期和类风湿性关节炎很相似，都以增殖性肉芽组织为特点的滑膜炎开始。