LAUSR

Objective Chronic low back pain is a main problem of public health. Its impact is responsible of many health-related expenses, as well as ergonomic organization for work. There is however no well-established biomechanical reference for this organization, which has led us to this study. The variation of all pelvic-spinal and lower limbs’ parameters are here studied through a quantified movement analysis during position changing from standing to sitting, on three kinds of seat, in healthy subjects. Material/Patients and methods Ten healthy subjects were included in our study. The stools were selected in order to let visible all points of reference for all studied segments (leg, thigh, pelvis, lordosis, kyphosis) by the VICON system, to allow 3D-movement capture. There were an ergonomic stool (seat 10°-bent forward), standard high stool (same height than the ergonomic stool) and standard low stool (horizontal thighs). The movements of the different segments were studied through 5 changing from standing to sitting for every subject. Results As expected we noticed that the height of the seat has an impact on hip flexion. The tights were significantly more flexed with the low standard stool (compared to the ergonomic stool, P  Discussion/Conclusion Our result is totally inconsistent with the dogma that an ergonomic stool (high seat bent forward) restores some lumbar lordosis. Supplementary studies are necessary in a large group and in more ecological conditions.