Key clinical point: Patients with isolated axial psoriatic arthritis (PsA) had a better functional status than those with both axial and peripheral disease. Human leucocyte antigen (HLA)-B*27 positivity was associated with isolated axial PsA and predicted the development of peripheral disease over time.
Major finding: Compared with patients with concomitant axial and peripheral disease, HLA-B*27 positivity (odds ratio [OR] 25.00; P < .003) and lower Health Assessment Questionnaire scores (OR 0.004; P < .01) were associated with isolated axial disease. HLA-B*27 positivity predicted the development of peripheral PsA in patients with isolated axial PsA (hazard ratio 7.544; P < .006).
Study details: Findings are from a longitudinal study including 1688 patients with ankylosing spondylitis and psoriasis and 1576 patients with PsA, of which 32 had isolated axial disease and 463 had axial with peripheral disease.
Disclosures: The University of Toronto Psoriatic Arthritis Program is supported by a grant from the Krembil Foundation. The authors declared no conflicts of interest.
Source: Kwok TSH et al. Isolated axial disease in psoriatic arthritis and ankylosing spondylitis with psoriasis. Ann Rheum Dis. 2022 (Aug 16). Doi: 10.1136/ard-2022-222537