Arthroereisis for the treatment of flatfoot in children: a kinematic comparison of in-and outside sinus tarsi implants

摘要

The flexible flatfoot is a common disorder in children and subtalar joint arthroereisis is a popular procedure. It uses a subtalar extra-articular implant to limit excessive eversion of the hindfoot without restricting inversion. We distinguish techniques inside (IST) and outside (OST) the sinus tarsi. In OST a 6.5 mm cancellous screw is inserted into the calcaneus and motion is limited by the head of the screw contacting against the lateral aspect of the talus [1].