Background: Ankle sprain are one of the most common injuries in sports and public health in general. Cross-slope may creat a risk for ankle sprain and are commonly found in both urban and rural environment.
Objective: The purpose of study was to clarify the environmental risk factor that can be easily occurred ankle sprain during walking (stance phase) and one leg standing at various ramp environment.
Methods: Participants was measured muscle activation on peroneus longus during both conditions (walk across the ramp and one leg stand in the transverse direction) of seven different angle (0∘, 2∘, 5∘, 10∘, 15∘, 20∘, 25∘). The measured data were analyzed using one-way ANOVA to investigate the effect of muscle activation on the each condition.
Results: Ankle sprain can be easily occurred when cross walk and one-leg stand on a ramp from higher than 10∘, and highest risk was angle of 25∘ or more. As a people with peroneus longus weakness walks a ramp, the ramp angle has a cross relationship with the sprain on the ankle.
Conclusions: If people with peroneus longus weakness walk on the more than 10∘ of ramp angle, they will need a lot of attention for prevent ankle sprain.
Keywords: Peroneus Longus; ankle sprain; cross ramp.