A Study of the Rollover Shape in Unimpaired Persons

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The rollover shape (RoS) of the foot and ankle complex is defined as “the result of the transformation of the center of pressure (CoP) of the contact forces from laboratory coordinates into shank-based coordinates.” It can be represented as an arc of a circle, and the radius is expressed as a percentage of body height. Its original purpose was to find a characteristic of prosthetic feet to assist in the alignment of prosthetic leg components. This study extends the knowledge of the population to measure the RoSs for both feet of 16 individuals (8 men and 8 women). The global mean (SD) of the radius of the rollover curve was 20.0% (7%) of body height. There was a significant difference measured between sexes: women, 21.4% (8%), and men, 18.5% (4%) (p < 1%, Tukey comparison men to women, n = 34). In any particular individual, there was a difference between the measured RoS for the left or right foot, but the global population was symmetric. Two other subjects, excluded from the group, showed much larger radii, and they appeared to walk predominantly on their toes. This suggests that the use of RoS as a general gait measure of natural gait has to be treated with care.

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