Foot Mechanics

Pronation

Definition:

Pronation is the inward roll of the foot. With pronation, the arch naturally rolls inward as the heel strikes acting as a cushioning mechanism. Over pronation occurs when the feet roll inward excessively, causing a person to have flat feet.

Overview:

    • Tight heel cords work against or cause hyper-pronation and need to be stretched.
    • Excessive pronation is treated with a medical hind-foot wedge attached to the orthotic.
    • Motion Control Shoes are recommended for excessive pronation.
    • Flat feet are either acquired with age or congenital.

 

Supination- High Arch/Cavus Foot

Definition:

Supination, also known as under-pronation, is the outward roll of the foot. Since the foot does not roll inward as much as necessary, wearing the wrong type of shoe can lead to painful shins and joints, or even injury.

Overview:

    • The weight-bearing area is decreased in a cavus foot.
    • It is usually a stiff foot with very little subtalar motion and mid-tarsal motion during ambulation.
    • The supinator’s shoes wear down along the outer (lateral) edge, and their feet tend to have high arches.
    • Cavus feet can give rise to
      • Plantar Fasciitis
      • Iliotibial Tract Tendonitis
      • Tarsal Tunnel Syndrome
      • Metatarsalgia
      • Heel pain