Abstract
A novel muscle, the anterior fibulocalcaneus, has been discovered bilaterally in the anterior compartment of the leg in three separate cadaveric dissections. This muscle originates from the fibula, anterior crural septum, and the investing fascia of the fibularis tertius. Its tendon passes anterior to the lateral malleolus to insert onto the calcaneus, anterosuperior to the fibular trochlea. Anomalous fibulocalcaneal muscles associated with the lateral malleolus have been noted to cause a variety of ankle pathologies, and supernumerary muscles within the talocrural joint have been utilized for surgical reconstructive procedures. Radiologists and clinicians should be aware of this muscle when embarking in diagnosis and imaging interpretation, especially when chronic ankle pain is localized anterior to the lateral malleolus (Lambert and Atsas, 2010).
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