Moment-arm measurement of the distance (M) between the distal tip of the lateral malleolus
and the center of the second metatarsal head (as extrapolated along the lateral column of the foot) standardized a constant torque of 10 N-m for each individual. This measurement (M), in the equation torque =
force × moment (M), allows the computer toprovide feedback on appropriate upward pressure
(force) to keep torque constant.