Method for detecting biomechanical and functional parameters of the knee, such method comprising: - a step for the set up of video recording means adapted to frame a scene; - a step for defining, in said scene, a global reference system integral with said video recording means; - a step for the set up of multiple optical markers at defined anatomical points of at least one foot and of the corresponding knee of a person, and such anatomical points identify a local reference system integral with said foot and at least one reference point of said knee; said method being characterized in that it further comprises: - a step for the set up, at the plantar surface of said foot, of baropodometric means integral with said local reference system; - a step for the acquisition, through said video recording means, of images of at least one reference action executed in said scene by said person provided with said optical markers and with said baropodometric means, and in such reference action said person executes at least one support movement of said foot on a support plane of said scene; - a step for the detection, through said baropodometric means, of baropodometric parameters indicative of dynamic interactions exchanged between said foot and said support plane during said image acquisition step; - a step for calculating the trajectories of said optical markers in said global reference system during said reference action, identifying the coordinates of said anatomical points in said global reference system; - a step for calculating, from said baropodometric parameters, the coordinates of the center of pressure of said foot with respect to said local reference system during said reference action; - a step for transforming the coordinates of said center of pressure in said global reference system; - a step for calculating, from said baropodometric parameters, the constraining reaction force acting on said foot during said reference action; - a step for calculating one force arm given by the distance between said center of pressure and said reference point of said knee, through the coordinates of said center of pressure and of said reference point in said global reference system; - a step for calculating a biomechanical parameter indicative of the valgus moment, and derived from the vector product of said force arm and said constraining reaction force applied on said center of pressure. - a step for the set up of video recording means adapted to frame a scene; - a step for defining, in said scene, a global reference system integral with said video recording means; - a step for the set up of multiple optical markers at defined anatomical points of at least one foot and of the corresponding knee of a person, and such anatomical points identify a local reference system integral with said foot and at least one reference point of said knee; - a step for the set up, at the plantar surface of said foot, of baropodometric means integral with said local reference system; - a step for the acquisition, through said video recording means, of images of at least one reference action executed in said scene by said person provided with said optical markers and with said baropodometric means, and in such reference action said person executes at least one support movement of said foot on a support plane of said scene; - a step for the detection, through said baropodometric means, of baropodometric parameters indicative of dynamic interactions exchanged between said foot and said support plane during said image acquisition step; - a step for calculating the trajectories of said optical markers in said global reference system during said reference action, identifying the coordinates of said anatomical points in said global reference system; - a step for calculating, from said baropodometric parameters, the coordinates of the center of pressure of said foot with respect to said local reference system during said reference action; - a step for transforming the coordinates of said center of pressure in said global reference system; - a step for calculating, from said baropodometric parameters, the constraining reaction force acting on said foot during said reference action; - a step for calculating one force arm given by the distance between said center of pressure and said reference point of said knee, through the coordinates of said center of pressure and of said reference point in said global reference system; - a step for calculating a biomechanical parameter indicative of the valgus moment, and derived from the vector product of said force arm and said constraining reaction force applied on said center of pressure.