ALL YOU NEED TO KNOW
Our soft tissues in our feet behave very much like elastic, in that if they are stretched too far they do not return to their original state. There is an elastic zone and an in-elastic zone. When the foot’s soft tissues enter the inelastic zone they experience micro-failure which over time leads to feet changing shape and size. Typically our muscles and joint structure of the foot is designed to try to prevent the foot entering the inelastic zone, however this can only do so much and the extra weight combined with the additional looseness of joints called laxity result in the foot changing shape. Particularly the dropping of the arch and the widening of the foot.
The pain that is experienced during pregnancy in our feet could be a result of our muscles tiring from trying to support the extra weight and the inflaming of our ligaments and tendons.
Shells work by providing support for the extra weight and prevents the foot from entering the micro-failure and inelastic zone. This is called the Tissue Stress Theory.