Framework for creating customized shape of the shoe insole

Abstract

Foot is the body part which is in constant contact with the ground. Since the foot has to adjust to the ground and transfer body weight properly, it is very susceptible to injuries and deformities. One of the most common deformities is flat foot that implies fallen arches. These deformities have influence on non-amenity during walking and on irregular body weight transfer. In order to return foot mechanics in normal acting, it is necessary to wear corrective insoles. This study presents the methodology aiming at speeding up the customized insole manufacturing process through creation of the so-called “digital chain”. Patients with flat foot leave footprint in polyurethane foam, which is later scanned and transferred into digital model. Selecting the appropriate points of the acquired scanned image data set defines input parameters for creating a spatial insole shape. These parameters, consequently, define boundary spatial curves, which in turn rule the insole’s free form shape. This is the basis for upgrading and setting up the initial shape with corrective elements.