EC Orthopaedics

Doctors do not have knowledge in the field of biomechanics, and therefore cannot understand the kinematics of the pairing of the bones of the skeleton of the feet. Speaking of flat feet, no one thinks about the presence of supporting arches, from which all deformations begin. This is the outer longitudinal and transverse vaults of the arched form. It is they that provide the spring function of the feet, dampen shock loads, protecting the brain from concussion. According to the laws of mechanics, it is these vaults that rest on three points, forming a reference triangle. The General Center of Gravity (GCG) of the body must be projected into the Center of Gravity (CG) of this triangle, into the area of its support to ensure the stability of the body, its vertical position.

In geometry, the surface is usually denoted by two coordinates X and Y. The angle between them is 90 degrees. This angle exists between the outer and transverse arches, which indicates their supporting function, regardless of the type of feet: narrow and long, or short and wide. The Center of Gravity of the supporting triangles in both types of feet lies at the intersection of the medians dividing the sides of the triangle in the middle. These are the tops of the vaults through which the load passes. So, in the external arch it falls on the cuboid bone. The cuboid bone forms a joint with the calcaneus that allows it to descend to the support, pushing forward the metatarsal bones with the 4^th and 5^th fingers. So, the large and peroneal muscles, plantar fascia are stretched.