Abstract
Introduction: A growing number of pediatric orthopaedic surgeons have adopted the Ponseti method for the treatment of idiopathic congenital clubfeet. Ponseti himself does not recommend the standard use of radiographs but suggests that palpation alone should be used to assess the correction in infant clubfeet. Although ultrasound diagnostic techniques for evaluating the infant foot are on the rise, most orthpaedic surgeon still rely on native radiographs to objectify the course of treatment. The aim of our study was to elucidate the role of radiographs in Ponseti clubfoot treatment.
Material and Methods: From the end of 2002 on we have used the treatment regime as originally described by Ponseti. Only infants with idiopathic clubfeet treated within the first three weeks of life were included. Radiographs of infant clubfeet are taken in ap.- view and lateral view in maximum dorsiflexion. Radiographs were taken at presentation mostly for legal documentation, before tenotomy at about 6 to 15 weeks of age, and 1 week after the percutaneous Achilles tenotomy (pAT). The tibiocalcaneal angle (Tib.C.-angle), the ap.- talo-calcaneal angle (TC-angle) and the lateral talo-calcaneal angle (lat. TC- angle) were evaluated. The maximum dorsiflexion was evaluated clinically.
Results: Forty-seven feet met the inclusion criteria. The mean gain of the tibiocalcaneal angle after tenotomy was 15,08 degrees. The ap.- talo-calcaneal angle only showed a mean change of 2,57 degrees and the lateral talo-calcaneal angle changed 0,44 degrees. The dorsi-flexion was found to have gained 13,85 degrees after tenotomy. The values of the tibiocalcaneal angle (Tib. C.-angle) and the values for dorsiflexion (DF) before and after pAT showed a significant difference (p< 0.05). No significant difference was found for the ap.- talo-calcaneal angle (TC-angle) and the lateral talo-calcaneal angle (lat. TC- angle) before and after tenotomy.
Discussion: The results of our series indicate that the tib-iocalcaneal angle changes about the same amount as the clinical dorsiflexion does. The ap.- talo-calcaneal angle (TC-angle) and the lateral talo-calcaneal angle (lat. TC- angle) were not influenced much by the Achilles tenotomy in our series. This seems reasonable as cutting of the Achilles tendon mostly influences the calcaneous which is the endpoint of the tendon. The dorsal opening of the talocalcaneal joint is coupled with derotation of the talus and calcaneous in the ap.-view and is hardly influenced by pAT. Although the position of the calcaneous in the heel can be palpated and even quantified by the empty heel sign according to Pirani, radiographs are the only way to objectify the true anatomy.
Theses abstracts were prepared by Professor Roger Lemaire. Correspondence should be addressed to EFORT Central Office, Freihofstrasse 22, CH-8700 Küsnacht, Switzerland.
