Radiological scoring methods for ankylosing spondylitis: a comparison between the Bath Ankylosing Spondylitis Radiology Index and the modified Stoke Ankylosing Spondylitis Spine Score.

摘要: Objective The main objective of the present study was to test interobserver reliability, truth, discrimination and feasibility two scoring methods available in ankylosing spondylitis (AS) over a follow-up period 3 years. Methods Two blinded trained observers scored 95 AS radiographs from cohort patients. Each radiograph by methods, modified Stoke Ankylosing Spondylitis Spine Score (mSASSS), Bath Radiology Index--spine (BASRI-spine). Interobserver agreement analyzed intraclass correlation coefficients (ICC). construct validity assessed examining with measures spinal mobility (Bath Metronomy Index--BASMI), functional limitation Functional Index--BASFI) disease duration. Bland Altman's 95% limits method effect size (ES) analysis were used estimate smallest detectable difference (SDD) radiological progression responsiveness. Results BASRI-spine reached intra- ICC 0.755 0.831, respectively. mSASSS scores more reliable, 0.874 0.941, Both systems correlated significantly BASMI (p = 0.01), while only showed significant 0.02) BASFI. With regards sensitivity change, it found that classified highest percentage patients changes than (mSASSS: 35.8% vs. BASRI-spine: 15.8%). ES also suggested responsive BASRI-spine. Concerning feasibility, takes less time for scoring. Conclusion We have shown offers advantages measurement properties is most appropriate which assess structural damage AS.