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Life sciences · Journal article
Clinical Rheumatology · August 11, 2026
Encouraging direction, but not yet definitive.
This cross-sectional study found that adiposity (measured by waist circumference and BMI) is independently associated with psoriatic arthritis presence in psoriasis patients, independent of established predictors like nail involvement and psoriasis duration, with a graded dose–response pattern. However, the cross-sectional design does not establish causality and exploratory subgroup findings by nail involvement status require confirmation. These results support investigating metabolic mechanisms in PsA development but do not yet change clinical practice.
Cross-sectional study. 519 psoriatic disease cases, of which 27.2% (n=141) had psoriatic arthritis. Participants had clinically confirmed psoriasis; arthritis status determined by clinical assessment.. Intervention: Adiposity measures: waist circumference and body mass index. Compared with: Classical clinical predictors: psoriasis duration ≥10 years, nail involvement, PASI score, and sex. n = 519.
Nail involvement (OR 3.31, p < 0.001) and psoriasis duration ≥10 years (OR 2.70, p < 0.001) were strongest independent predictors of PsA Waist circumference showed graded association across quartiles (aOR per quartile increase 1.28, 95% CI 1.05–1.56; p = 0.016) BMI showed comparable association with PsA; discrimination similar between adiposity measures (AUC 0.74 vs 0.73; DeLong p = 0.33)
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These findings suggest adiposity may be an independent risk factor for PsA development in psoriasis patients, potentially informing weight management counselling. However, the cross-sectional design prevents causal inference, and clinicians should await prospective studies before incorporating adiposity quantification into PsA risk stratification algorithms.
Cross-sectional study with adequate sample size and multivariable adjustment showing a graded association between adiposity and PsA, but lacks temporal sequence, causality cannot be inferred, and interaction findings are exploratory.
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These findings suggest adiposity may be an independent risk factor for PsA development in psoriasis patients, potentially informing weight management counselling. However, the cross-sectional design prevents causal inference, and clinicians should await prospective studies before incorporating adiposity quantification into PsA risk stratification algorithms.
Graded across the dimensions that decide whether you should act, each from what the source actually supports. There is no single score, and where a dimension was not assessed it says so.
Abstract Background Psoriatic arthritis (PsA) develops in a substantial proportion of patients with psoriasis. Although obesity has been linked to PsA, whether adiposity independently amplifies articular risk beyond established predictors remains incompletely defined. Objective To explore whether adiposity showed a graded association with PsA across different clinical strata. Methods This cross-sectional study included 519 psoriatic disease cases (27.2% with PsA). Multivariable logistic regression models assessed the association of waist circumference (per 10 cm) and body mass index (BMI) with PsA, adjusting for psoriasis duration ≥ 10 years, nail involvement, PASI, and sex. Interaction terms between adiposity measures and classical predictors were explored. Model discrimination was evaluated using the area under the receiver operating characteristic curve (AUC), and correlated AUCs were compared using the DeLong test. Results Nail involvement (OR 3.31, p < 0.001) and psoriasis duration (OR 2.70, p < 0.001) were the strongest independent associations with PsA. An ordinal quartile-based model supported a graded association across waist circumference categories (aOR per quartile increase 1.28, 95% CI 1.05–1.56; p = 0.016). BMI showed a comparable association, and discrimination was similar between adiposity measures (AUC 0.74 vs 0.73; DeLong p = 0.33). No significant interaction was observed between adiposity and psoriasis duration or severity. Exploratory interaction analyses suggested that the adiposity–PsA association may differ according to nail involvement status. Conclusions Adiposity was independently associated with the presence of PsA and showed a graded relationship across adiposity levels. These findings support a potential link between metabolic burden and articular disease expression in psoriatic disease. Key points• Adiposity was independently associated with psoriatic arthritis beyond classical clinical predictors.• Waist circumference and BMI showed comparable graded associations with psoriatic arthritis probability.• The adiposity–psoriatic arthritis association appeared stronger in patients with nail involvement.
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