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Corns and Calluses

Corns and calluses are areas of thickened skin on the plantar surfaces of the foot or interphalangeal joints.

Biomechanical etiology

Corns and calluses develop from excess friction on the foot. Corns normally develop on the upper joints of the toes, while calluses generally develop on the underside of the foot. Corns and calluses commonly develop when excess pronation disrupts the normal metatarsal bone relationship in the foot, which causes the toes to claw. Friction related to footwear is also a major contributor.


Orthotics are designed to control excess pronation and prevent plantar flexion of the metatarsal bones and clawing of the toes.