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Background  In the management of early inflammatory joint of ankylosing spondylitis (AS), there is a need for reliable noninvasive quantitative monitoring biomarker to closely assess status of synovitis progression. Cognizant to this,studies geared on improving techniques for quantitative evaluation of micro-environment permeability of the joint space are necessary. Such improved techniques may provide tissue perfusion as important biological parameters and can further help in understanding the origin of early changes associated with AS. The purpose of this study was to prospectively evaluate the diagnostic performance and determine longitudinal relationships of early micro-environment active in the joint space of the sacroiliac joint (SIJ) with a rat model by using quantitative dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI).    Methods  Thirty wistar male rats were randomly assigned to the model ( n  = 15) or control ( n  = 15) group. All rats underwent DCE-MRI of SIJ region at fixed time points (12, 17 and 22 weeks),between September 2018 and October 2019. Differences in permeability parameters between the two groups at the same time point were compared by using an independent samples  t  test. Spearman correlations of DCE-MRI parameters with different time points in model group were analyzed. All statistical analyses were performed with software.    Results  At 12 weeks,the K trans ,K ep  and V e  values in the model group were slightly lower than those in control group,but all the differences were not statistically significant ( p  > 0.05). Compared with control group,the transfer constant (K trans ) values increased significantly at 17 weeks and 22 weeks in model group,while the rate constant (K ep ) and volume of extravascular extracellular space (V e ) significantly increased only at 22 weeks( p  < 0.05). The K trans ,K ep  and V e  were positively correlated with increasing time points ( r  = 0.946,  P <0.01 for K trans ;  r  = 0.945,  P <0.01 for K ep ; and  r  = 0.832,  P <0.01 for V e ).    Conclusion  Quantitative DCE-MRI parameters are valuable for evaluating the early longitudinal relationship of micro-environment permeability changes in the joint space of SIJ.

Quantitative DCE-MRI: an efficient diagnostic technique for evaluating early micro-environment permeability changes in ankylosing spondylitis