Association of Nail Psoriasis With Disease Activity Measures and Impact in Psoriatic Arthritis: Data From the Corrona Psoriatic Arthritis/Spondyloarthritis Registry

Objective. To examine the association of nail psoriasis with disease activity, quality of life, and work productivity in patients with psoriatic arthritis (PsA). Methods. All patients with PsA who enrolled in the Corrona PsA/Spondyloarthritis Registry between March 2013 and October 2018 and had data on physician-reported nail psoriasis were induded and stratified by presence vs absence of nail psoriasis at enrollment. Patient demographics, disease activity, quality of life (QOL), and work productivity at enrollment were compared between patients with vs without nail psoriasis using t-tests or Wilcoxon rank-sum tests for continuous variables and chi-square or Fisher exact tests for categorical variables. Results. Of the 2841 patients with PsA included, 1152 (40.5%) had nail psoriasis and 1689 (59.5%) did not. Higher proportions of patients with nail psoriasis were male (51.9% vs 44.1%) and disabled from working (12.3% vs 7.8%) compared with patients without nail psoriasis (all P < 0.05). Patients with nail psoriasis had higher disease activity than those without nail psoriasis, including higher tender and swollen joint counts, worse Disease Activity Index for Psoriatic Arthritis and Psoriatic Arthritis Disease Activity Score values, and increased likelihood of having enthesitis and dactylitis (all P < 0.05). Patients with nail psoriasis had worse pain, fatigue, and work and activity impairment than those without nail psoriasis (all P < 0.05). Conclusion. Patients with PsA who have nail psoriasis had worse disease activity, QOL, and work productivity than those without nail involvement, emphasizing the importance of identification and management of nail disease in patients with PsA.