Condition characterized by rigidity of the foot, decreased mobility of the subtalar joint, and a decrease in internal rotation of the tibia during locomotion. After the foot strikes the ground, the heel remains everted. The longitudinal arch remains high and rigid, and the mid-tarsal joint does not unlock. During running, the foot remains inflexible so that it cannot conform easily to the underlying running surface. Therefore, the foot absorbs the full force of the impact with the ground. Athletes with cavus foot are susceptible to a number of injuries including stress fractures of the foot, plantar fasciitis, and Achilles tendinitis. The permanently high longitudinal arch may also cause problems on the top of the foot if footwear is not cut high enough or laces are tightened too much, so that the foot becomes constricted during running.
Subjects: Sports and Exercise Medicine.