Wireless and retrofittable in-shoe system for real-time estimation of kinematic and kinetic gait parameters

A method for calibrating a gait measurement system, comprising the steps of:

• i) providing an instrumented insole having a plurality of pressure-sensing cells;
• ii) exerting known, uniform pressure on said instrumented insole;
• iii) recording a respective output for each of said pressure-sensing cells in response to pressure exerted on said instrumented insole during the performance of step (ii);
• iv) applying a plurality of fitting functions to said respective output of each of said pressure-sensing cells, thereby obtaining a plurality of respective model data;
• and
• v) applying cross validation to said respective model data to obtain a calibration model for each of said pressure-sensing cells.

A method for calibrating a gait measurement system, comprising the steps of:

• i) providing an instrumented insole and a reference measuring apparatus;
• ii) recording a first data set from said instrumented insole and a second data set from said reference measuring apparatus;
• iii) computing center of pressure trajectories from said first and said second data sets;
• iv) validating the accuracy of said center of pressure trajectories using one or more regression models;
• and
• v) calibrating said instrumented insole via said first and said second data sets.