Anteromedial meniscofemoral ligament of the knee: CT and MR features in 3 cases.

We report 3 cases of AnteroMedial MeniscoFemoral Ligament (AMMFL) fortuitously demonstrated during knee imaging in three patients. This rare normal variant of insertion of the anterior horn of the medial meniscus consists of an anomalous fibrous band distinctly covering the whole length of the anterior cruciate ligament to attach the anterior horn of the medial meniscus to the posterolateral wall of the femoral intercondylar fossa. AMMFL was diagnosed during arthro-CT in two patients and clearly identified during knee MR imaging in a third patient. The two cases demonstrated during arthro-CT--one prospectively and the other retrospectively--were confirmed during therapeutic arthroscopy. We illustrate the anomaly, discuss its controversial clinical significance and review the literature.