Relationship between spinal mobility measures and quality of life in patients with ankylosing spondylitis

The aim of this study was to assess spinal mobility status and Quality of life (QoL) of patients with ankylosing spondylitis (AS) and determine the relationship between spinal mobility and measures of clinical condition including QoL. A total of 74 patients with AS were included in this study. Disease specific instruments Bath Ankylosing Spondylitis Metrology Index (BASMI), Bath Ankylosing Disease Activity Index (BASDAI) and Bath Ankylosing Spondylitis Functional Index (BASFI) were applied, and mobility testing: occiput-wall distance and chest expansion. QoL was assessed by the Short Form-36 (SF-36). The mean age was 48.5 years; there were significant correlations between BASMI score and age (P < 0.001), disease duration (P < 0.001), symptoms duration (P < 0.001) and BASFI (P < 0.001). BASMI was negatively correlated with SF-36 physical function subscale (P < 0.001) and general health subscale (P = 0.029). In multivariate regression analysis, BASFI score (P < 0.001) was independently associated factor with physical function domain of SF-36. This study showed that in AS spinal mobility measures are associated with physical function, general health, emotional role and mental health domains of QoL.