Applicability of the MASEI index in enthesis and its association with other indices/serological markers of activity in patients with spondyloarthritis

Introduction

The enthesis is one of the target organs in patients with spondyloarthritis (SpA), since inflammation of it, known as enthesitis, can be observed, which in many patients with spondyloarthritis could go unnoticed.

Objective

To find the relationship between the MASEI index (MAdrid Sonographic Enthesitis Index) in entheses and other indices/serological activity markers (such as BASDAI, DAPSA or ASDAS and ESR, CRP) in spondyloarthritis patients.

Materials and methods

Observational, descriptive, and cross-sectional study. Data were collected from patients with SpA who underwent musculoskeletal ultrasound using the MASEI index and who were treated in our clinics from May 2021 to September 2021. As appropriate, the variables evaluated were described using frequency and central tendency/dispersion measures. First, we tested the normality of all the variables using a Shapiro–Wilk test. Then we studied the correlation of parametric and non-parametric numerical variables, using Pearson's and Spearman's coefficients. We used the T-Student, Mann–Whitney U, and chi-square tests for the categorical variables.

Results

We analyzed 24 patients with SpA (with a mean age of 50.50 ± 10.63 years), 8 women and 16 men. The variables have the following average levels: ASDAS 2.35 (±1.09); BASDAI (for those with axial involvement) 4.54 (±2.93); DAPSA (for psoriatic arthritis) 10.98 (±6.85), and total MASEI 19.88 (±14.77). We found a correlation between the total MASEI and the following variables: ASDAS (Pearson coefficient = .696), BASDAI (Spearman coefficient = .823), and DAPSA (Pearson coefficient = .823).

Conclusion

Patients with spondyloarthritis with more significant disease activity measured by ASDAS, BASDAI/DAPSA, and the serological markers of inflammation CRP and ESR present a higher total MASEI than patients who are controlled.