Congenital Vertical Talus

Congenital vertical talus (CVT) is a rare foot deformity that is usually recognized in infancy because the foot has a characteristic rigid, flat, rocker-bottom appearance. The problem occurs when the talus and navicular bones are not positioned normally, leaving the talus in a more vertical position and the navicular displaced from its normal relationship with the talus. Unlike a flexible flatfoot, the deformity does not correct normally with manipulation. Early recognition is important because treatment is designed to restore the alignment of the foot while the bones and soft tissues are still developing.

Anatomy

The talus connects the leg to the foot and transfers weight from the tibia through the ankle. The navicular sits in front of the talus and contributes to the medial arch.

In congenital vertical talus, the talus becomes vertically oriented and the navicular moves dorsally out of its normal position. This disrupts the normal arch and produces the characteristic convex or rocker-bottom appearance of the sole. Tight and contracted soft tissues can further hold the foot in this abnormal position.

The exact cause of CVT is not always known. It can occur as an isolated deformity, but it is also associated with neuromuscular and developmental conditions.

What the deformity looks and feels like

CVT is generally recognized because the foot is rigid and non-correctable rather than flexible.

The hindfoot is positioned downward while the forefoot is dorsiflexed and abducted, creating the rocker-bottom appearance. The head of the talus may be prominent and palpable on the bottom of the foot, and deep creases may be present across the top of the foot.

As a child begins walking, pressure beneath the prominent talar head can lead to pain and callus formation. Walking may also become abnormal or awkward if the deformity is not corrected.

Physical Exam

The diagnosis starts with a careful physical examination. We look at the overall position of the foot and, most importantly, determine whether the deformity can be corrected with gentle manipulation.

A truly vertical talus remains displaced even when the foot is brought into plantarflexion. This distinction is important because a flexible deformity may look similar but requires a different treatment approach.

We also consider whether the child has other medical or neurologic conditions because CVT can occur in association with conditions such as arthrogryposis, myelomeningocele, spina bifida, and cerebral palsy.

Imaging

X-rays help confirm the diagnosis and define the position of the bones. AP, oblique, and lateral views can demonstrate the vertically positioned talus and dorsal displacement of the navicular.

A forced plantarflexion lateral X-ray is particularly useful because it shows whether the talonavicular joint remains dislocated even when the foot is placed into plantarflexion. Persistent dislocation supports the diagnosis of true congenital vertical talus rather than a more flexible deformity.

Additional imaging or evaluation may be appropriate when there is concern for an associated neurologic or developmental condition.

Similar diagnoses

Several newborn foot deformities can initially resemble CVT.

Oblique talus is generally more flexible, with the talonavicular relationship improving when the foot is placed into plantarflexion. Calcaneovalgus foot is also flexible and may improve with stretching. Posteromedial tibial bowing can create an apparent foot deformity because of the shape of the tibia. Tarsal coalition can cause a stiff flatfoot but is generally a consideration in older children rather than newborns.

Determining whether the deformity is truly rigid is therefore an important part of the evaluation.

Early treatment focuses on improving flexibility

Treatment begins with gentle manipulation and serial casting. The foot is gradually brought toward a more corrected position, generally using inversion and plantarflexion, and the cast is changed regularly to progressively stretch the contracted soft tissues.

Casting can improve flexibility and make subsequent correction easier, but it often does not completely correct a true congenital vertical talus. For this reason, surgical correction is frequently necessary.

When surgery becomes necessary

Surgery is used to restore the normal relationship between the talus and navicular and to address the tight structures holding the foot in its abnormal position.

The surgical approach may include release of contracted soft tissues, reduction of the talonavicular joint, and temporary stabilization with pins. Depending on the deformity, the Achilles, peroneal, and extensor tendons may also require lengthening, and the spring ligament may be reconstructed.

The source material describes surgical correction most commonly during infancy, when the developing foot remains more amenable to correction.

Selected patients may be treated with a minimally invasive approach that uses serial casting followed by closed reduction and percutaneous Achilles tenotomy.

For severe or resistant deformities, more extensive salvage procedures may be required, particularly in older children.

After care

After surgical correction, the foot is maintained in a cast to protect the correction. Once the initial immobilization period is complete, bracing and physical therapy help maintain the alignment and develop strength and function.

Long-term follow-up remains important because the foot continues to grow after treatment. We monitor the child’s alignment, function, and development to make sure the correction is maintained and to identify recurrence early.

What can happen without treatment

Congenital vertical talus does not simply resolve on its own. Without correction, the foot can become progressively more rigid and develop persistent deformity, abnormal walking mechanics, and pain. Delayed or inadequate treatment can make later reconstruction more difficult.

Early evaluation gives the treatment team an opportunity to work with the developing foot before the deformity becomes increasingly rigid.

Outcomes

The goal of treatment is a stable, plantigrade, functional foot that allows the child to walk normally and participate in age-appropriate activities.

Successful treatment is not simply about making the foot look straighter. We want the talus and navicular to be properly aligned, the foot to remain flexible enough for normal function, and the child to develop a stable walking pattern.

Children generally do well when the deformity is identified and treated appropriately, although continued follow-up is important as the foot grows.

When to contact our office

An infant should be evaluated promptly if the foot appears rigid, has a pronounced rocker-bottom shape, or cannot be brought into a normal position with gentle manipulation. Early assessment is particularly important because CVT can be confused with other, more flexible newborn foot deformities.

Emergency care is generally not required for the deformity itself. Prompt medical attention is appropriate if there is significant swelling, redness, or another concerning change following casting or surgery.