INTRODUCTION
Ankylosing Spondylitis Disease Activity Score (ASDAS) is a new measurement tool to assess disease activity in patients with spondyloarthritis (SPA). It was developed because of BASDAI’s limitation for being totally patient-derived with limited validity. The aim of the study was to compare ASDAS with BASDAI for evaluation of spondyloarthritis activity in our department.
MATERIALS
We included cases of pondyloarthritis fulfilling ASDAS or AMOR classification criteria. The demographic characteristics were collected as well as clinical and biological characteristics. Disease activity was assessed by BASDAI and ASDAS-CRP at the same visit. The correlation between ASDAS and BASDAI was evaluated using Pearson’s correlation coefficients (r, p values). Statically significant covariate was considered if  p < 0.05.
RESULTS
Among 84 cases, the mean age was 40.8+/-14.2 years, with a male predominance in 60.7% of the cases. The SPA was a pure axial form in 6 patients (7.14%), association of axial, peripheral and enthesic form was in 35 cases (41.6%). The mean BASDAI was 4.51+/-1,8 and the mean ASDAS was 2.77+/-1.1. A very strong positive correlation was found between BASDAI and ASDAS (r = 0.33 P <0.005). Thirty eight percent of patients had an inactive disease according to BASDAI whereas 14.3% had an inactive disease according to ASDAS. Among patients who had a high disease activity according to BASDAI, 2 patients were inactives according to ASDAS score (3.8%), 12 patients had a moderate activity (23.1%), 19 patients had a high activity (36.5%) and 19 others had a very high activity (36.5%).
CONCLUSION
Our study suggests that ASDAS and BASDAI scores have a good discriminative ability and correlation. However, multiple studies showed that the use of the ASDAS-CRP index is more appropriate for a more pertinent evaluation of disease activity.


Correlation between BASDAI and ASDAS to evaluate the activity of patients with spondyloarthritis