Diagnostic Value of CT in Sacroiliac Joint with Ankylosing Spondylitis / 实用放射学杂志

ABSTRACT

Objective To study the CT appearances of sacroiliac joint with ankylosing spondylitis(AS) and evaluate the pathology's degree,in order to improve the early diagnosis of AS.Methods 65 cases with AS were examined with CT.52 cases were males and 13 cases were female.The age ranged from 16 years to 52 years with average age of 23.6 years.Results In 65 cases,CT showed Ⅰ degree in 11 cases(16.9%),Ⅱdegree in 22 cases(33.8%),Ⅲdegree in 24 cases(36.9%) and Ⅳdegree in 8 cases(12.3%).Bilateral sacroiliac joint were involved in 54 cases(83.1%) and one side involved in 11 cases(16.9%).Early CT findings included coarse articular facet,interrupted joint cortex,vague articular face,subcortical microcysts and sclerotic articular surface,while joint space was normal.CT findings in progressive stage were uneven articular facet,serrated bony cortex,subcartilaginous bone microcysts,obviously sclerotic articular surfaces,extended joint space.In stable stage,CT findings included joint ankylosis and articular space disappearance.Conclusion CT examination is favourable for early diagnosis of AS.