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Objective One aim was to find the prevalence of chronic changes demonstrated on SIJ-MRI of early stage ax-SpA and their relationships with BME, the other was to disclose the correlations between MRI lesions and other objective variables. Methods 90 early stage ax-SpA patients with BME demonstrated on SIJ-MRI were enrolled in this study. Scores of active and chronic MRI lesions were correlated to find their significance in disease evaluation. The relationships between MRI lesions and objective clinical and laboratory variables were also analyzed.