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Collateral Ligaments of the Ankle: High-Resolution MR Imaging with a Local Gradient Coil and Anatomic Correlation in Cadavers¹

¹ From the Departments of Radiology (C.M., L.R.F., T.R., L.Y., E.C.W., A.S., R.W.M.D., D.T., D.R.) and Pathology (P.H.), Veterans Affairs Medical Center, 3350 La Jolla Village Dr, San Diego, CA 92161; the Department of Pathology, University of California, San Diego (P.H.); and the Department of Diagnostic Radiology, University of Kiel, Kiel, Germany (C.M.). Received May 4, 1998; revision requested May 27 and received June 15; accepted June 23. Supported in part by Veterans Affairs grant SA360 and the Deutsche Forschungsgemeinschaft. Address reprint requests to D.R.

Findings at high-resolution magnetic resonance (MR) imaging of the lateral and medial collateral ligaments of the ankle were compared with findings in anatomic sections from cadavers. MR imaging of six cadaveric feet was performed with a newly developed local gradient coil and axial and coronal T1-weighted spin-echo sequences. Axial imaging provided optimum views of the anterior and posterior talofibular ligaments, the deep layers of the medial collateral ligament, and the tibionavicular ligament. Coronal imaging allowed complete visualization of the calcaneofibular, posterior talofibular, tibiocalcaneal, and posterior tibiotalar ligaments. In both imaging planes, differentiation of the deep and superficial layers of the medial collateral ligament was possible. Differentiation between the syndesmotic complex and the lateral collateral ligament was accomplished easily; in particular, differentiation of the posterior tibiofibular ligament from the posterior talofibular ligament was not difficult because of the differing insertions of these ligaments. The inhomogeneous appearance of the medial collateral ligament and the posterior talofibular ligament on MR images correlated with areas of fatty tissue on corresponding microscopic sections. High-resolution MR imaging with a newly developed local gradient coil allows excellent visualization of the lateral and medial collateral ligaments of the ankle.

Index Terms: Ankle, anatomy, 46.92 • Ankle, MR, 46.121411 • Ligaments, MR, 46.121411 • Magnetic resonance (MR), coil arrays, 46.121411

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