Session Type: Poster Session (Sunday)
Session Time: 9:00AM-11:00AM
Background/Purpose: The modified Stoke Ankylosing Spondylitis Spinal Score (mSASSS) is a representative tool for assessing radiographic progression in spine of ankylosing spondylitis (AS) patients. However, also other joint involvement than spine is common in AS patients. In particular, involvement of hip joints is common in AS patients, but there is not enough assessment of the involvement of the hip joint. The purpose of this study was to investigate the association between radiographic progression of the hip and SI joints and mSASSS in patients with AS.
Methods: In a total of 210 patients, simple x-ray images of spine, hip, and sacroiliac (SI) joints were obtained. The changes in SI joints were graded based on New York criteria, and the hip joint changes were assessed as joint space narrowing and osteophyte. The correlation between mSASSS and each joint was analyzed using Spearman’s correlation. In addition, the factors were associated with radiographic progression were analyzed using multivariable regression.
Results: The mean age of the patients was 36.02 ± 8.89 years, and males were 91.9%. the grade of joint space narrowing and osteophyte were significantly correlated with mSASSS (r=0.31, r=0.22, r=0.34, p< 0.01), and the grade of SI joint was also significantly correlated with mSASSS (r=0.66, p< 0.01). In the correlation between mSASSS and other variables, Bath Ankylosing Spondylitis Functional Index (BASFI) showed significant correaltion with mSASSS (r=0.39, p< 0.01). In regression analysis, the radiographic progression of hip and SI joints was associated with mSASSS. In addition, age and BASFI were associated with mSASSS (Table 1).
Conclusion: Radiographic change of hip and SI joint was associated with mSASSS. Therefore, when evaluating the radiographic progression of the spine, we should consider hip joint change to evaluate the joint movement in patients with AS.
To cite this abstract in AMA style:Kang J, Nam S, Sung H, Joo K, Koo B, Lee S, Kim T. Radiographic Association of Hip and SI Joints in Ankylosing Spondylitis Patients [abstract]. Arthritis Rheumatol. 2019; 71 (suppl 10). https://acrabstracts.org/abstract/radiographic-association-of-hip-and-si-joints-in-ankylosing-spondylitis-patients/. Accessed June 2, 2020.
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ACR Meeting Abstracts - https://acrabstracts.org/abstract/radiographic-association-of-hip-and-si-joints-in-ankylosing-spondylitis-patients/