The foot plays a significant role in the function of structures connect to it. Much like the foundation of a building it has to be stable in order to minimise stress on these structures. Dysfuction in the  mechanics of the foot influence the following injuries:

Shin Splints

Tibial Stress / fracture (shin bone pain)

Calf strain/ muscle tears

Patellofemoral joint pain

ITB Friction Syndrome (runners knee)

Patella Tendinopathy (Jumpers Knee)

Pes Anserine Bursitis

Medial and lateral compartment osteoarthritis of the knee