Abstract
Objective: The purpose of this study was to assess the performance of computed tomography (CT) scan and magnetic resonance imaging (MRI) for detecting sacroiliitis in nonradiographic SpA (nr-SpA).
Methods: This cross-sectional monocentric double-blind study included 63 patients consulting for symptoms suggestive of SpA between February 2014 and February 2017. Patients with conventional radiographs showing a confirmed sacroiliitis (grade 3 or 4) were not included. Eligible patients underwent CT and MRI of sacroiliac joints (SIJ). CT and MR images were interpreted by 2 experienced musculoskeletal radiologists blinded to clinical and laboratory data. Two professors in rheumatology blinded to radiologists’ conclusions analyzed clinical data, laboratory tests, HLA typing, X-rays, CT and MRI images, and divided the patients into 2 groups: confirmed nr-SpA or no SpA. This classification was considered the gold standard when analyzing the results.
Results: 46 women and 17 men were included in this study. 47 patients were classified as confirmed nr-SpA (74.6%) and 16 patients as no SpA (25.4%). Sensitivity, specificity, and positive and negative predictive values of CT and MRI for detecting sacroiliitis were, respectively, estimated at 71.7%, 71.4%, 89.2%, 43.5%, and 51.2%, 100%, 100%, and 40%. CT and MRI findings were found to be statistically associated (p<0.001).
Conclusion: SIJ MRI is a highly specific method in the detection of sacroiliitis, but with a moderate sensitivity. SIJ CT scan, usually known as the third option after radiography and MRI, has much greater diagnostic utility than it has been documented previously.
Graphical Abstract
[http://dx.doi.org/10.1136/annrheumdis-2012-203201] [PMID: 23696633]
[PMID: 3262757]
[http://dx.doi.org/10.1002/art.1780241205] [PMID: 6976786]
[http://dx.doi.org/10.1007/s00296-018-4130-1] [PMID: 30132215]
[http://dx.doi.org/10.1016/j.jbspin.2004.08.003] [PMID: 16461204]
[http://dx.doi.org/10.1097/00007632-199611150-00009] [PMID: 8961447]
[http://dx.doi.org/10.1016/j.carj.2015.08.001] [PMID: 26632100]
[http://dx.doi.org/10.1136/annrheumdis-2014-206971] [PMID: 25837448]
[http://dx.doi.org/10.1002/art.38738] [PMID: 24909765]
[http://dx.doi.org/10.1002/art.33466] [PMID: 22081446]
[http://dx.doi.org/10.1136/ard.62.6.519] [PMID: 12759287]
[http://dx.doi.org/10.1111/1756-185X.13679] [PMID: 31833212]
[http://dx.doi.org/10.2214/ajr.136.1.41] [PMID: 6779578]
[PMID: 27143184]
[http://dx.doi.org/10.1259/bjr.20150700] [PMID: 29099615]
[http://dx.doi.org/10.1259/bjr.20150196] [PMID: 26670154]
[http://dx.doi.org/10.1007/s002560050388] [PMID: 9677647]
[http://dx.doi.org/10.1034/j.1600-0455.2003.00034.x] [PMID: 12694111]
[http://dx.doi.org/10.1002/art.24024] [PMID: 18975311]
[http://dx.doi.org/10.4081/reumatismo.2016.885] [PMID: 27608795]
[http://dx.doi.org/10.1136/ard.2009.108233] [PMID: 19297344]
[http://dx.doi.org/10.3899/jrheum.110423] [PMID: 21885516]
[http://dx.doi.org/10.1136/annrheumdis-2014-205408] [PMID: 24925836]
[http://dx.doi.org/10.1016/j.jbspin.2020.105106] [PMID: 33186734]
[http://dx.doi.org/10.1002/art.27571] [PMID: 20496416]
[http://dx.doi.org/10.1007/s11926-016-0607-7] [PMID: 27435070]
[http://dx.doi.org/10.5114/reum.2018.79499] [PMID: 30505010]
[PMID: 27089638]
[http://dx.doi.org/10.1002/art.39551] [PMID: 26681230]
[http://dx.doi.org/10.1093/rheumatology/kex491] [PMID: 29253272]
[http://dx.doi.org/10.3109/03009742.2015.1105289] [PMID: 26982485]
[PMID: 31249274]
[http://dx.doi.org/10.4103/2349-0977.191042]
[http://dx.doi.org/10.1002/art.1780331202] [PMID: 2260998]
[http://dx.doi.org/10.1097/00004728-199601000-00013] [PMID: 8576484]
[http://dx.doi.org/10.1148/radiology.180.1.2052702] [PMID: 2052702]
[PMID: 8938866]
[http://dx.doi.org/10.1007/s10067-019-04824-7] [PMID: 31797168]