Morphologic variations of the dorsal tarsometatarsal ligaments of the foot.

This study investigated the anatomical features of the dorsal tarsometatarsal ligaments of the foot for the purpose of analyzing the ligamentous components and classifying their types. Fifty embalmed cadaveric feet from 27 adult cadavers were dissected in this study. The dorsal tarsometatarsal ligaments comprised nine components (first cuneiform-first metatarsal, dCn1-M1; first cuneiform-second metatarsal, dCn1-M2; second cuneiform-second metatarsal, dCn2-M2; third cuneiform-second metatarsal, dCn3-M2; third cuneiform-third metatarsal, dCn3-M3; third cuneiform-fourth metatarsal, dCn3-M4; cuboidthird metatarsal, dCb-M3; cuboid-fourth metatarsal, dCb-M4; cuboid-fifth metatarsal, dCb-M5). The dCn3-M4 and dCb-M3 had not been previously reported. The dCn1-M1, dCn1-M2, dCn3-M2, dCn3-M4, and dCb-M3 had only one band, the dCn2-M2 had two bands, and the others had one or two bands. The ligaments originating from Cb attached simultaneously to M3 and M4 (4/50), M4 and M5 (7/50), or M3 and M5 (5/50), which were Y-shaped (dCb-M3, 4 and dCb-M3, 5), or V-shaped (dCb-M4, 5). The dorsal tarsometatarsal ligaments were classified into four types according to the presence of each component. In Type I (52%), Type II (36%), Type III (10%), and Type IV (2%), all components were observed except for one, two, three, and four components, respectively. The dimensions of each component were measured, and as a result the dCn1-M1 was found to be the widest and longest of the dorsal ligaments while the dCn1-M2 was found to be the thickest. The dorsal tarsometatarsal ligaments comprised nine components and were classified into four types. (c) 2018 Wiley Periodicals, Inc.