Characterization of a sliding linear investigative platform for analyzing lower-limb stability (SLIP-FALLS)

Falling exacts a burdensome cost on society via increased health-related expenditures, morbidity and mortality. A novel device has been designed to study falling potential, the sliding linear investigative platform analyzing lower-limb stability (SLIP-FALLS). The SLIP utilizes air bearing technology, which minimizes the friction between fixed and translating surfaces, resulting in nearly zero friction. This ability to virtually eliminate friction makes possible new tests of postural instability, of slipping and falling, and of neurological thresholds for postural control. Subject response can be incorporated into control/feedback loops where coupling between the platform and the sway pattern can be adjusted. Coupling enables perturbations to originate from the internal sway of subjects in addition to external stimuli. Translations (controlled slips) of up to 28 cm are possible at velocities between 5×10^-9 and 50 cm/sec with precise control and monitoring of displacement, velocity and acceleration