Metatarsus adductus is a foot deformity characterized by an inward bending of the front half of the foot.

Alternative Names

Metatarsus varus; Forefoot varus

Causes, incidence, and risk factors

Metatarsus adductus is thought to occur as a result of the infant's position inside the uterus. It can occur when the feet are bent inward, toward the midline, at the instep. This is a relatively common disease affecting about one out of every 1,000 to 2,000 live births. Risk factors may include a condition called oligohydramnios where the mother does not produce enough amniotic fluid in the uterus.

Signs and tests

Physical examination is sufficient to diagnose metatarsus adductus.

Treatment

Treatment depends on the severity of the deformity. Most children with metatarsus adductus can correct the deformity with normal use of their feet as they develop. These cases do not require any treatment. For children who cannot do this, but who have an affected foot that can be easily manipulated to normal positioning, stretching exercises are all that is needed. Rarely, this disease causes a rigid deformity that cannot be corrected with simple manipulation. In these cases, casting and even surgery may be required. Other diagnoses may need to be considered in these children. A pediatric orthopaedic surgeon should be involved in treating more severe deformities.

Expectations (prognosis)

Prognosis is excellent with nearly all patients attaining a normal appearing, fully functional foot.

Complications

Developmental dislocation of the hip may be associated with a small number of infants with metatarsus adductus.

Calling your health care provider

Call your health care provider if you are concerned about the appearance or flexibility of your infant's feet.