Fascia prevents muscles from tearing and breaking, and also prevents muscle hernias. If muscles were not surrounded by fascia, their action would not be even and coordinated, and they would rupture and tear. They would not reach the strength or power that they are capable of achieving.
The elastic property of fascia helps to push on and maintain venous openings after they have been squeezed by contraction. Lesions of the fascia and the adjacent muscle inhibit venous return and lead to congestion and eventual pathology. The movement of venous blood and lymph depends to a large degree on muscular activity that works against and along the fascial planes. Thickening and/or shortening of the fascia combined with insufficient muscular activity slow the influx of blood and lymph.
Fascial thickening develops as a response to forces of tension and mechanical demands. Excessive thickening is frequently accompanied by shortening, which results in excessive restriction so that movement in the area becomes restricted.
There are a number of plantar fasciitis causes. The plantar fascia ligament is like a rubber band and loosens and contracts with movement. It also absorbs significant weight and pressure. Because of this function, plantar fasciitis can easily occur from a number of reasons. Among the most common is an overload of physical activity or exercise. Certain types of arthritis and diabetes can also make the body more susceptible to plantar fasciitis.
A thorough clinical evaluation should be performed when the plantar fascia has become inflamed. Irritation and subsequent inflammation commonly has an underlying cause such as poor motor control in the associated muscles or muscle imbalances in the body that have allowed for altered foot mechanics and undue stress at the plantar foot.