ABSTRACT
Objective To study the diagnostic value of imageology(CR,CT and MRI) for sacraoiliac pathological changes(SIPC) in ankylosing spondylitis(AS).Methods A retrospective analysis was made on the manifestations of CR,CT and MRI of the sacraoiliac joints in 98 cases of clinically-proved AS,including the grading,site and number,calcification,joint-space and sub-articular-surface-bone changes.Results The characteristics of AS in sacraoiliac joint on CR were: joint-space narrowing(67),articular-surface sclerosis(22),cystic change(15) and joint stiffness(17) and calcification(38).CT features were:the lesions involving iliac-side synovium of the sacraoiliac joint mainly,chondral calcification(55),joint-space narrowing(42),cystic change(43) and sclerosis(65) of the articular surface and sub-surface bone structure,and calcification of sacraoiliac-ligament(52).MRI showed: articular-cartilage damage(40),edema around the lesion(57) and intrabony fat sedimentation(15).Conclusion For sacraoiliac joint in AS,CR examination is the basic imaging method,CT in grading lesions is more accurate,while SIPC in AS can be early diagnosed by MRI.