Objectives This study aimed to evaluate the clinical characteristics and associated factors of hip arthritis in patients with ankylosing spondylitis (AS).
Methods A retrospective analysis evaluated 488 patients of AS with hip arthritis at a single tertiary hospital in South Korea. Hip arthritis was assessed by Bath Ankylosing Spondylitis Radiology Hip Index (BASRI-h) and the average joint space width of the hip joint at three distinct sites that are in between the acetabulum and femoral head at baseline and last visit of outpatient clinic. Clinical and laboratory characteristics were collected.
Results Among 488 patients with AS, 60 (12.3%) patients had hip arthritis. Body mass index (BMI) and erythrocyte sedimentation rate (ESR) were associated with hip involvement in AS (OR 1.11, 95% CI 1.03 to 1.19, p=0.008 and OR 1.01, 95% CI 1.00 to 1.02, p=0.005, respectively). The mean X-ray follow-up duration was 81.4±35.7 months. During the follow-up period, ESR and C-reactive protein (CRP) decreased significantly and there was no significant radiographic change in the hip joints. Among 60 patients, 7 (11.7%) patients had radiographic progression of the hip joints and 5 (8.3%) patients had hip replacement surgery. The BMI tended to be higher in patients with radiographic progression of the hip joints than in those without (23.4±4.2 vs. 26.6±3.9, p=0.068).
Conclusions Most of the patients with hip arthritis in AS had no significant radiographic progression during the follow-up period. BMI was associated with hip involvement in patients with AS.
Disclosure of Interest None declared
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