<p num="48">FIELD: medicine.</p> <p num="49">SUBSTANCE: invention relates to medicine, namely to traumatology and orthopedics, and can be used in planning correction of foot deformities (reconstruction), including all its departments, when deformation components (angulation, translation, shortening) are located in a sagittal plane. X-ray image of a foot made in a lateral projection is used to define the point "a" corresponding to the posterior edge of the articular surface of the ankle block, and the point "b" corresponding to the front edge. Point "c" corresponding to a reference point of the head of the first metatarsal bone and a point "d" corresponding to a reference point of a heel bone are determined. All points are connected. Quadrangle is constructed, where ab is an upper side, and dc is a lower side, using reference values <img src="/get_item_image.asp?id=39272099&img=00000019.jpg" class="img_big">dab = 103.2° (± 7.2), <img src="/get_item_image.asp?id=39272099&img=00000019.jpg" class="img_b
