Reactive stepping ability of individuals with incomplete spinal cord injury

Up to 75% of individuals with incomplete spinal cord injury (SCI) experience at least one fall each year. Reactive stepping is one strategy used to prevent falls. Our objective was to describe reactive stepping ability of individuals with incomplete SCI compared to able-bodied adults. Forty-two individuals participated (17 with incomplete SCI). Participants adopted a forward lean position whilst attached to a rigid structure through a horizontal cable positioned at waist height. The release mechanism was unexpectedly triggered to elicit reactive stepping. Behavioural responses (i.e. single step, multi-step, fall) were significantly different between groups whereas movement timing of the stepping leg (i.e. step-off, step contact) was not significantly different. The onset of muscle activation was significantly slower for two lower extremity muscles in participants with SCI compared to able-bodied adults. Reactive stepping ability is likely impaired in individuals with incomplete SCI suggesting reactive balance control should be targeted in SCI rehabilitation.M.Sc