Abstract

Determine whether the postural function was impaired by comparing the performances in upright standing at ground in adult subjects with HLA-B27 carriers with Inflammatory Back Pain (IBP). Eleven subjects participated in the study, and all participants performed eight trials while standing upright on a platform with their feet on firm and foam surfaces. Tests were performed with their eyes open or closed and two-leg or one-leg supports. The postural sway was examined with a force platform that records sway indices, which were generally associated with group, firm or foam surfaces, open- or closed-eyes condition, and two-leg or one-leg standings after adjusting for age and gender. The differences of sway indices in HLA-B27 carriers with IBP were significantly increased at different trials when compared with controls. This study supports the hypothesis that HLA-B27 carriers with IBP weaken control of postural sway in varying stressful positions.

Keywords:Inflammatory back pain; HLA-B27; Sway index; Posture; Balance