Method and system of modifying three-dimensional model of foot to create modified three-dimensional model

A system for modifying a 3D model of a foot to create a modified 3D model, the system comprising:

• an image-capture device configured to capture a 3D model of the foot;
• and
• a processor configured to:
• obtain the 3D model of the foot from the image-capture device;
• identify from the 3D model:
• a first point corresponding to a plantar head of 1. metatarsal,
• a second point corresponding to a plantar head of 5. metatarsal
• a third point corresponding to a pternion;
• an Achilles tendon center of coronal axis;
• define:
• a first straight line passing via the first point and the second point;
• a second straight line perpendicular to the first straight line and passing via the second point, the second straight line having direction parallel to a plane defined by the first point, the second point and the third point;
• a third straight line being perpendicular to the plane and passing via the third point;
• divide the 3D model to a heel part and a toe part, wherein the heel part comprises from 30% up to 70% of the total foot in direction of the second straight line;
• and
• create the modified 3D model by:
• rotating and translating the heel part in a way that the second straight line passes via the third point, wherein the rotation and translation is parallel to the plane, and
• rotating the heel part in a way that the Achilles tendon center of coronal axis is parallel to the third straight line.