Feature of Fatty Deposition in Sacroiliac Joints in Ankylosing Spondylitis Patients Seen By MRI

Zaiying Hu¹, Qing Lv², Xiaohong Wang³, Zetao Liao⁴, Zhiming Lin⁵ and Jieruo Gu⁴, ¹Rheumatology, Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China, ²Rheumatology, the Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China, ³Radiology, Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China, ⁴Rheumatology, The Affiliated Third Hospital of Sun Yat-san University, Rheumatology, Guangzhou, China, ⁵The Affiliated Third Hospital of Sun Yat-san University, Rheumatology, Guangzhou, China

Meeting: 2014 ACR/ARHP Annual Meeting

Keywords: MRI and ankylosing spondylitis (AS)

Session Information

Title: Imaging of Rheumatic Diseases: Magnetic Resonance Imaging (MRI)

Session Type: Abstract Submissions (ACR)

Background/Purpose: Fatty deposition (FD) is often seen in ankylosing spondylitis (AS) patients in the sacroiliac joints (SIJs). Magnetic Resonance Imaging (MRI) is a useful equipment to detect FD. The feature of FD of AS patients is seldom reported. We planned to investigate the feature of FD in SIJs in AS patients seen by MRI that may help in diagnosing.

Methods: This was a retrospective study. MR images of SIJs of 353 AS patients and 224 non-spondyloarthritis (SpA) patients were read by a radiologist and a rheumatologist without knowing the history of patients. FD were recorded and compared between two groups.

Results: Totally 1154 SIJs were studied and FD were recorded in 611 (52.95%) of them. FD was significantly more often to be seen in AS group than in non-SpA group (71.95% vs. 22.99%, p<0.01). There was no difference of positive FD rate between the left SIJs and the right SIJs either in AS group (left vs. right = 70.82% vs. 73.9%, p>0.05) or non-SpA group (24.11% vs. 21.88%, p>0.05). FD was more frequently seen in the upper half than the lower half SIJs in AS group (79.89% vs. 64.02%, p<0.01). The ilium bones were with more FD than the sacrum bones in AS group (83.85% vs. 60.06%, p<0.01). The rate of FD was of no difference between the upper and the lower half SIJs or between the ilium and sacrum bones in non-SpA group (both p>0.05). In AS group, the rate of FD was of no difference between patients under 25 years old (n=191) and over 45 years old (n=25) (70.68% vs. 76%, p=0.58). In non-SpA group, the rate of FD was significantly higher in patients over 45 years old (n=58) than under 25 years old (n=54) (53.45% vs. 7.41%, p<0.01).

Conclusion: Our study found that fatty deposition was much more often to be seen in AS patients than non-SpA subjects. FD appeared more in the upper half and ilium bones and did not depend much on age in AS patients.

Disclosure:

Z. Hu,
None;

Q. Lv,
None;

X. Wang,
None;

Z. Liao,
None;

Z. Lin,
None;

J. Gu,
None.

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