The intrinsic subtalar ligaments: (1) interosseous ligament, (2) cervical ligament, and (3) deep fibers of the extensor retinaculum. Reprinted with permission of Hertel J, Denegar CR, Monroe MM, Stokes WL. Talocrural and subtalar joint instability after lateral ankle sprain. Med Sci Sports Exerc. 1999;31:1501–1508; Lippincott Williams & Wilkins.41