Children with congenital vertical talus (CVT) have been treated with extensive soft-tissue releases, with a high rate of complications. Recently, reverse Ponseti-type casting followed by percutaneous reduction and fixation has been described, with excellent results in separate cohorts of children with CVT, of either idiopathic or teratological aetiology. There are currently no studies that compare the outcome in these two types. We present a prospective cohort of 13 children (21 feet) with CVT of both idiopathic and teratological aetiology, in which this technique has been used. Clinical, radiological and parent-reported outcomes were obtained at a mean follow-up of 36 months (8 to 57). Six children (nine feet) had associated neuromuscular conditions or syndromes; the condition was idiopathic in seven children (12 feet).

Initial correction was achieved in all children, with significant improvement in all radiological parameters. Recurrence was seen in ten feet. Modification of the technique to include limited capsulotomy at the initial operation may reduce the risk of recurrence.

The reverse Ponseti-type technique is effective in the initial correction of CVT of both idiopathic and teratological aetiology. Recurrence is a problem in both these groups, with higher rates than first reported in the original paper. However, these rates are less than those reported after open surgical release.

Cite this article: Bone Joint J 2014;96-B:274–8.

Background

Congenital vertical talus (CVT) is a rare deformity of the foot. It has been historically treated with extensive soft tissue releases with significant associated complications. Recently, reverse Ponseti-type casting followed by minimally invasive or percutaneous reduction and fixation has been described with excellent results in separate cohorts of either idiopathic or teratologic cases of CVT. There are currently no studies that compare the outcomes between the two types.

Introduction

Albania is one of the poorest countries in Western European with a GDP per capita standing at 26 percent of the EU average in 2010. Whilst there is government-funded universal free provision of healthcare, it is accepted that delivery is patchy, not accessible to all and lacking expertise for more complex paediatric orthopaedic conditions. With the sponsorship of a UK-based charity, we have set up and completed 5 visits to Albania (3 assessment and 2 operative) to provide additional expertise for paediatric orthopaedic disorders running parallel to and utilising currently available local services. We present the results of this treatment and training programme to date.

Background: The treatment of congenital vertical talus has traditionally consisted of manipulation and application of casts followed by extensive soft-tissue releases. However, this treatment is often followed by severe stiffness of the foot and other complications. The purpose of this study was to evaluate a new method of manipulation and cast immobilization, based on principles used by Dobbs et al in patients with idiopathic congenital vertical talus, but applied in teratologic congenital vertical talus.

Methods: Five consecutive cases of teratologic congenital vertical talus deformity were prospectively followed at a minimum of nine months post treatment with serial casting and limited surgery consisting of percutaneous Achilles tenotomy, fractional lengthening of the anterior tibial tendon, and percutaneous pin fixation of the talonavicular joint. The principles of manipulation and application of the plaster casts were similar to those used by Ponseti to correct a clubfoot deformity, but the forces were applied in the opposite direction. Clinical and radiographic assessments were carried out at the initial, immediate postoperative and the latest follow-up.

Results: Initial correction was obtained both clinically and radiographically in all five feet. A mean of eight casts was required for correction. At the final evaluation, the mean ankle dorsiflexion was 20° and the mean plantar flexion was 31°. Radiographically, dorsal subluxation of the navicular recurred in one patient, but was functionally insignificant as the patient was a non-ambulator and required treatment for seating purposes only. At the time of the latest follow-up, there was a significant improvement in all of the measured radiographic parameters compared with the pretreatment values.

Conclusions: Serial manipulation and cast immobilization followed by talonavicular pin fixation and percutaneous tenotomy of the Achilles tendon provides excellent results, in terms of the clinical appearance of the foot, and deformity correction, in patients with teratologic congenital vertical talus.