Special FocusDeltoid Ligament InsufficiencyHynes, Kelly MD, FRCSC, FAAOSAuthor Information Department of Orthopaedic Surgery & Rehabilitation Medicine, University of Chicago Medicine, Chicago, IL The author declares no conflict of interest. Address correspondence and reprint requests to Kelly Hynes, MD, FRCSC, FAAOS, 5841 South Maryland Avenue, MC, Chicago, IL 60637. E-mail: [email protected]. Techniques in Foot & Ankle Surgery: March 2021 - Volume 20 - Issue 1 - p 6-13 doi: 10.1097/BTF.0000000000000313 Buy Metrics Abstract Deltoid ligament insufficiency can be present after an ankle sprain or fracture and in the setting of adult acquired flatfoot. If symptoms of medial ankle instability persist after nonoperative treatment for an ankle sprain, deltoid ligament repair or reconstruction may be indicated. More commonly, deltoid ligament injuries occur at the time of rotational ankle fractures. The indications for acute deltoid ligament repair in the setting of fracture are of great interest and debate. This chapter will review the conditions of deltoid ligament insufficiency in the setting of sprains and fractures including the current state of evidence and technique for operative repair. Level of Evidence: Diagnostic Level V. See Instructions for Authors for a complete description of levels of evidence. Copyright © 2021 Wolters Kluwer Health, Inc. All rights reserved.