Risk factors and early detection of joint damage in patients with psoriasis: a case–control study

Abstract Background Our aim was to target the unsatisfied need for early detection of the at‐risk population and determine the subgroup of patients whose psoriasis (PsO) could transform into psoriatic arthritis (PsA). Methods A retrospective and longitudinal case–control study was conducted at Beijing Chao‐yang Hospital. It included 75 patients who were clinically diagnosed with PsA in the case group and 345 who solely suffered from PsO without PsA in the control group. A variety of baseline covariates were gathered from every patient with PsO. Univariate and multivariate analyses and receiver operating characteristic (ROC) curves were used to identify underlying risk factors and determine whether it was necessary to examine the imaging of PsO patients. Results In multivariate logistic regression analysis, age ≥40 (odds ratio (OR): 1.04, 95% confidence interval (CI): 1.02–1.06, P < 0.01), nail involvement (OR: 1.17, 95% CI: 1.09–1.32, P < 0.01), erythrocyte sedimentation rate (ESR) (OR: 1.03, 95% CI: 1.01–1.06, P < 0.05) and elevated high‐sensitivity C‐reactive protein (hs‐CRP) (OR: 1.31, 95% CI: 1.13–1.53, P < 0.01) were perceived to be risk factors for the transformation from PsO into clinical PsA. By combining magnetic resonance imaging (MRI)‐detected enthesitis with tenosynovitis, combined predictors demonstrated better diagnostic efficacy, with an improvement in specificity (94.3% vs. 69%) and similarities in sensitivity (89% vs. 84.6%). The areas under the ROC curve (AUCs) amounted to 0.925 (95% CI: 0.882–0.967, P < 0.01) and 0.858 (95% CI: 0.814–0.903, P < 0.01). Conclusions It wa s identified that age ≥40, nail involvement, as well as an elevated ESR, and hs‐CRP served as independent risk factors for PsO transforming into PsA. Additionally, MRI provides additional value for the early recognition of PsA.