Comparison of radiological indices (SASSS, M-SASSS, BASRI-s, BASRI-t) in patients with ankylosing spondylitis.

This study was performed to compare radiologic methods of Bath Ankylosing Spondilitis Radiology Index-spine (BASRI-s), Bath Ankylosing Spondilitis Radiology Index-total (BASRI-t), Stoke Ankylosing Spondilitis Spine Score (SASSS) and Modified Stoke Ankylosing Spondilitis Spine Score (M-SASSS) and to test their superiority over each other. Eighty-one patients (60 males, 21 females) with ankylosing spondylitis (AS) were included in the study. Patients were evaluated for their functional status, disease activity, quality of life, and spinal mobility using Bath AS Functional Index (BASFI), Bath AS Disease Activity Index (BASDAI), AS Quality of Life Index (ASQoL) scale, and Bath AS Metrology Index (BASMI), respectively. Radiographs of the patients were evaluated using BASRI-s, BASRI-t, SASSS, and M-SASSS methods. Spearman's correlation test was used for the correlation analysis. Significant correlations were found between the duration of disease with radiological indices (P < 0.05), BASMI with SASSS (P < 0.01), M-SASSS (P < 0.01), BASRI-s (P < 0.01), and BASRI-t (P < 0.01). Furthermore, there were correlations between BASFI with SASSS (P < 0.05), M-SASSS (P < 0.05), BASRI-s (P < 0.05). and BASRI-t (P < 0.05). According to the results of our study, among these four radiological measuring methods, SASSS appears to be the one that is the least reflective of patient status. The reason to that is the fact that while in SASSS method only lumbosacral radiography is evaluated, in other methods one more area is evaluated. However, the disadvantages of BASRI methods relative to others, in BASRI methods, patients are exposed to more radiation.