Background:Structural change within pubic symphysis (PS) occurs in 20–25% of patients with spondylarthritis (SpA). It occurs in all developmental stages, even in the early stages of the disease. Changes in the symphysis can sometimes precede spine and sacroiliac involvement. Radiological findings in PS were poorly described in the SpA, especially on its non-radiographic form (nr-axSpA).Objectives:We aimed in this study to evaluate pubic symphyseal features in patients with a confirmed diagnosis of nr-axSpA and to assess the correlation of these changes with clinical and imaging features of nr-axSpA in these patients. We also focused on the relationship between parity and radiographic changes in pubic symphysis (PS).Methods:We retrospectively reviewed the data of 40 patients diagnosed with nr-axSpA according to the ASAS criteria. Radiological-morphological changes of PS were assessed in pelvic radiography by two distinct rheumatologists. Grading symphysial involvement was made as follow: scores ranged from 0-4 per reading: grade 0 = normal; grade 1 = subtle irregularity and/or subchondral sclerosis, grade 2 = clear erosions, 3 = marked sclerosis, grade 4 = ankylosis.For all patients, we calculated the Bath Ankylosing Spondylitis Disease Activity Index (BASDAI) and the BASRI (Bath Ankylosing Spondylitis Radiology Index).For all patients, we recorded the sacroiliac changes showed by the previous pelvic radiography and/or the pelvic scanner and/or by magnetic resonance imaging (MRI).Results:We enrolled forty patients with a sex-ratio H/F=1/3. Mean age of patients at diagnosis was 39,9 +/- 10,8 [17-59]. Forty percent of patients had peripheral enthesitis, and 45% had peripheral arthritis. BASDAI mean score was 4,63 +/- 0,9 [0-8,6]. HLA B-27 was present in 32,3% of cases. We noted radiographic changes in PS in 37,5% (15 patients): grade 1 (n=1), grade 2 (n=10), grade 3 (n=3) and grade 4 (n=1). There was not a significant difference between the sex group (p=0,85). A comparison of 2 groups (women with 3 children or more and women with less than 3 children) concluded that childbirth did not modify PS changes (p=0,9). Also, PS changes did not differ with age (p=0,5). There was no correlation between the BASRI value with the presence of PS changes nor with its grades (p=0,5 and p=0,89, respectively). Also, disease activity did not influence the PS involvement (p=0,4). Radiological findings in PS was not correlated with the sacroiliac features found on MRI or pelvic CT scan (p=0,59 and p=0,1).Conclusion:In SpA criteria, PS changes were not considered. It can be an additional help in making the diagnosis. Interestingly, pubic symphysis may exist without sacroiliitis.Disclosure of Interests:None declared.