Dynamics of feet dorsiflexion after percutaneous Achilles lengthening for correction of flat feet in children

BACKGROUND: Achilloplasty is one of the most common procedures in the reconstruction of various foot deformities. Achilles tendon lengthening is often used in most reconstructive interventions in patients with flatfeet. Literature data reflecting the dynamics of foot dorsiflexion after percutaneous achilloplasty are limited. AIM: This study aimed to determine the foot dorsiflexion dynamics in children with flatfeet at different time points after foot reconstruction in combination with percutaneous Achilles tendon lengthening. MATERIALS AND METHODS: The study included the observation results of 159 children (260 feet) aged 12 (9–17) years having flatfeet with Achilles tendon shortening after flatfoot reconstruction and percutaneous Achilles tendon lengthening. Dynamic follow-up was performed for 3 years after foot reconstruction. The obtained data were analyzed statistically by nonparametric one-factor analysis of variance, Kruskal–Wallis and post hoc test, pairwise comparisons, and Dwass–Steel–Critchlow–Fligner test. RESULTS: At follow-up after Achilles tendon lengthening, significant differences were obtained in the magnitude of the initial foot dorsiflexion up to 2 years after surgery, and other indicators were not significantly different. Foot dorsiflexion with tarsal joint stabilization was significantly different at all stages of follow-up compared with baseline. Foot dorsiflexion tended to decrease throughout the follow-up period. CONCLUSIONS: After reconstructive interventions on the feet in combination with percutaneous Achilles tendon lengthening, the dorsiflexion of the feet decreased over time. At 2 and 3 years after Achilles surgery, dorsiflexion was not significantly different from baseline. The angle of dorsiflexion of the feet with the tarsal joint stabilization 3 years after Achilles tendon lengthening was significantly different from the initial level, but throughout the follow-up there was also a tendency to its gradual decrease.