Inter-Rater Reliability of the Progressive Pain Check Method for Standardized Pain Assessment in Lipedema

Background: Lipedema is a chronic progressive condition affecting approximately 10% of women, characterized by disproportionate subcutaneous adipose tissue accumulation and pain in the lower extremities. Standardized assessment methods for pain evaluation in lipedema remain limited. The Progressive Pain Check (PPC) method represents a potentially valuable tool for standardized pain assessment in lipedema patients. Objective: To evaluate the inter-rater reliability of the PPC method for clinical assessment of evoked pain in lipedema patients. Methods: Two independent assessors performed PPC evaluations. Inter-rater reliability was assessed using the Intraclass Correlation Coefficient [ICC(2,1), two-way random-effects, absolute agreement, single-measurement] with 95% confidence intervals (CI). Results: This study included 429 women diagnosed with lipedema (mean age 41.2 ± 11.5 years, mean disease duration 27.2 ± 12.6 years). Patient characteristics revealed mean BMI of 29.5 ± 6.9 kg/m2, predominantly Type III lipedema presentation, and disease onset during adolescence (mean age 14 ± 9.3 years). The PPC method demonstrated excellent inter-rater reliability between two independent assessors across all examined anatomical districts. Conclusions: The PPC method shows promise as a simple, repeatable, and standardized clinical tool for evoked pain assessment in lipedema patients. The demonstrated inter-rater reliability supports its potential utility in clinical practice. Further research is warranted to evaluate its intra-rater reliability, concurrent validity, and responsiveness in monitoring treatment effects.