Pedobarographic changes during first month after subtalar extra-articular screw arthroereisis (SESA) operation of juvenile flexible flatfoot

Abstract

Background Juvenile flexible flatfoot deformity is a common problem in childhood. In severe cases, the subtalar extra-articular screw arthroereisis (SESA) according to De Pellegrin is a viable and effective option. There are just a few retrospective studies showing long-term outcomes, but the interval right after the surgery has not been described so far, even though the short time of healing is one of the great benefits of this technique. In this study, we examined if the pedobarographic measurements are able to demonstrate functional changes in the month after surgery. Methods Data were analyzed for seven patients (13 feet). Measurements were performed before surgery, as well as 3, 14 and 28\xa0days after. For analysis, the foot was comparted in six areas—fore-, mid- and hindfoot, each split in their lateral and medial parts. Plantar forces and contact area were measured under static and dynamic conditions. Time-dependent changes of plantar acting forces and the contact area were compared. Results During bipedal stance, the ground force increased significantly in lateral foot areas ( p \u2009<\u20090.001) and decreased in medial areas ( p \u2009<\u20090.001). While the force in the medial midfoot remained reduced, in the medial forefoot, the force increased 14\xa0days after surgery ( p \u2009<\u20090.05) Conclusion The functional changes after SESA can be accurately assessed using pedobarography. The results indicate morphologic changes of the foot, in particular the development of a longitudinal arch. Post-surgical progression can be monitored and success of the surgery can be verified.