Arthroereisis is a rare and disputed procedure, where an implant screw is inserted into the sinus tarsi to treat flatfoot deformity. Weight-bearing radiographs are the most essential examinations to assess the correct localization and related measurements. Hardware loosening is the most common complication seen as localized lucency and as dislocation of the implant. Computed tomography yields superior resolution with reconstruction capabilities. On magnetic resonance imaging, the implant appears as a dark signal focus on T1 and T2-weighted images with a hyperintense T2-signal rim. As the data on the imaging of arthroereisis are scarce, we aimed here to review the typical imaging findings.
Arthroereisis; Computed tomography; Flexible flatfoot; Magnetic resonance imaging; Radiographs; Subtalar implant
Citation: Mika T. Nevalainen, Johannes B. Roedl, Adam C. Zoga, William B. Morrison Imaging findings of arthroereisis in planovalgus feet http://dx.doi.org/10.1016/j.radcr.2016.08.014
Received: 9 August 2016, Revised: 21 August 2016, Accepted: 22 August 2016, Available online: 22 September 2016
Copyright: © 2016 Published by Elsevier Inc. on behalf of under copyright license from the University of Washington. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
In conclusion, arthroereisis is a rare procedure used to treat symptomatic flexible flatfoot. It is essential to have weight-bearing lateral and anteroposterior radiographs to evaluate the medial longitudinal arch of the foot and the subtalar joint space. Radiographs are an excellent screening tool for assessment of implant position. Comparison with prior examinations can document changes in position representing migration, which is the most commonly seen radiologic complication. CT and MRI are superior imaging modalities for evaluating preoperative fitting of the implant and postoperative complications.