The objectives of this study were to determine whether the fibulotalocalcaneal (FTC) ligament of the ankle, described in anatomical literature, can be identified on magnetic resonance (MR) imaging studies.
Magnetic resonance imaging was performed on 6 cadaver ankles, which were then sectioned axially. The posterolateral ankle was inspected on MR imaging and cadaver sections for ligamentous thickening corresponding to the components of the FTC ligament: main stem and talar and peroneocalcaneal laminae.
The entire FTC ligament or components of it were seen in 5 (83%) of 6 ankles. In 3 (50%) of 6, all 3 components were present. The main stem of the FTC ligament attached to the posteromedial aspect of the lateral malleolus and then divided inferiorly into 2 laminae: The talar lamina extended horizontally to the talus, and the peroneocalcaneal lamina descended vertically to the calcaneus.
The FTC ligament is a sheetlike extrinsic ligament, which is in continuity with the deep posterior crural fascia of the ankle and is visible on MR imaging.
From the *Department of Radiology, Veterans Affairs Healthcare System, San Diego, CA; †Department of Radiology (Centre for Biomedical Imaging Research and Development), Westmead Hospital, Western Clinical School of The University of Sydney, Sydney, Australia; and ‡Department of Radiology, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand.
Received for publication December 19, 2007; accepted June 25, 2008.
Reprints: Anthony J. Peduto, MBBS, FRANZCR, Department of Radiology, Westmead Hospital, Western Clinical School of The University of Sydney, Darcy Road, Westmead, Sydney, Australia 2145 (e-mail: firstname.lastname@example.org).