Authors: YouHyun Lee Yeon Sik Hong Won Park SeongRyul Kwon Hyo Jin Choi SeungJae Hong Chan Hee Lee ChangHee Suh SunWon Park Ji Young Hwang Jisoo Lee
Publish Date: 2012/08/04
Volume: 33, Issue: 4, Pages: 1005-1011
Abstract
The objective of this study is to investigate the value of multidetector computed tomography MDCT in the assessment of sacroiliitis in patients with established ankylosing spondylitis AS Paired plain radiographs and MDCT images of the 330 sacroiliac SI joints in 165 patients with definite or probable ankylosing spondylitis were analyzed for sacroiliitis Sacroiliitis on plain radiographs were graded on a scale of 0–4 according to the modified New York NY criteria For grading of sacroiliitis by MDCT modified NY criteria were revised for MDCT application introducing the concept of quantification The relationship between sacroiliitis grades by plain radiography and MDCT was analyzed by two radiologists blinded for all clinical data Of the 330 SI joints assessed there was agreement between the sacroiliitis grading by plain radiography and MDCT in 73 221 SI joints Sacroiliitis grade by MDCT was higher in 250 758 SI joints and lower in 7 21 SI joints than that by plain radiography Using the MDCT 836 of patients met the modified NY radiologic criteria for the classification of AS compared with 582 of the patients by plain radiography Twentysix percent of the patients who did not meet the modified NY criteria for the classification of AS by plain radiography met the criteria by MDCT Disease durations in patients with grade 2 and grade 3 sacroiliitis were significantly shorter in patients evaluated by MDCT compared with plain radiography MDCT is a useful imaging method that can be applied to the initial diagnosis of the AS and by better visualization of SI joint changes it can be used to predict the progress of the disease
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