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• Clinical Article •
MRI features of sacroiliac joint bone marrow fat-saturated T2WI high signal in osteitis condensans ilii
LIU Chaoran  LI Wenjuan  ZHU Yunfei  HE Xiaojun  ZHANG Ke  HONG Guobin 

Cite this article as: LIU C R, LI W J, ZHU Y F, et al. MRI features of sacroiliac joint bone marrow fat-saturated T2WI high signal in osteitis condensans ilii[J]. Chin J Magn Reson Imaging, 2023, 14(6): 52-58. DOI:10.12015/issn.1674-8034.2023.06.008.


[Abstract] Objective To explore the features and rules of sacroiliac joint bone marrow fat-saturated T2WI (T2WI-FS) high signal in osteitis condensans ilii (OCI) and axial spondyloarthritis (ax-SpA).Materials and Methods Twenty-three female patients diagnosed with OCI and thirty-four female patients diagnosed with ax-SpA between January 2017 and December 2021 were retrospectively enrolled. The incidence and imaging features of sacroiliac joint bone marrow T2WI-FS high signal were assessed, with a particular focus on the characteristics such as location, range, shape, and signal intensity.Results Compared with the ax-SpA group, the overall incidence of high T2WI-FS signal in the sacroiliac joint was lower in the OCI group [56.5% (13/23) vs. 85.3% (29/34); χ2=5.857, P=0.016]. The incidence of high T2WI-FS signal in the bilateral sacroiliac joint was also lower [26.1% (6/23) vs. 55.9% (19/34); χ2=4.946, P=0.026]. However, there was no significant difference in the incidence of high T2WI-FS signal in unilateral sacroiliac joint [30.4% (7/23) vs. 29.4% (10/34); χ2=0.007, P=0.934]. There were no significant differences between the OCI group and the ax-SpA group in terms of the side, upper/lower part, quadrant and medial margin of high signal distribution in the sacroiliac joint (P＞0.05). In terms of morphology, the OCI group mainly exhibited a ribbon-like shape, while the ax-SpA group mainly showed a flaky morphology, and the difference was statistically significant (P＜0.001). The high signal range and signal intensity of sacroiliac joint T2WI-FS were also statistically significant between the OCI group and the ax-SpA group (P＜0.001). However, there were no significant differences in the high signal range and intensity of T2WI-FS between the sacral and iliac sides, superior and inferior parts, and among quadrants in the OCI group (P＞0.05).Conclusions Sacroiliac joint bone marrow T2WI-FS high signal can be seen in OCI, which is usually presented as a small ribbon adjacent to the sclerotic margin with slightly high signal, and contributes to the differential diagnosis of bone marrow edema associated with ax-SpA.
[Keywords] osteitis condensans ilii；axial spondyloarthritis；sacroiliac joint；magnetic resonance Imaging

LIU Chaoran   LI Wenjuan   ZHU Yunfei   HE Xiaojun   ZHANG Ke   HONG Guobin*  

Department of Radiology, Fifth Affiliated Hospital, Sun Yat-Sen University, Zhuhai 519000, China

Corresponding author: Hong GB, E-mail: honggb@mail.sysu.edu.cn

Conflicts of interest   None.

ACKNOWLEDGMENTS National Natural Science Foundation of China (No. 82272104); The Science, Technology Project in the Social Development Field of Zhuhai City (No. ZH22036201210066PWC); Clinical research IIT project of the Fifth Affiliated Hospital of Sun Yat-sen University (No. YNZZ2020-06).
Received  2022-09-02
Accepted  2023-06-09
DOI: 10.12015/issn.1674-8034.2023.06.008
Cite this article as: LIU C R, LI W J, ZHU Y F, et al. MRI features of sacroiliac joint bone marrow fat-saturated T2WI high signal in osteitis condensans ilii[J]. Chin J Magn Reson Imaging, 2023, 14(6): 52-58. DOI:10.12015/issn.1674-8034.2023.06.008.

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