Symptomatic Osseous Abnormalities at the Posteromedial Tubercle of the Talus: Magnetic Resonance Imaging Features.

Osseous alterations adjacent to the posteromedial tubercle of the talus that lead to posterior ankle impingement and their imaging findings have been much less well described than alterations of the posterolateral tubercle. We present 5 cases of osseous abnormalities at the posteromedial tubercle of the talus depicted on magnetic resonance imaging in subjects with chronic symptoms at this location, with no history of local trauma, who had presented with posteromedial mechanical pain and/or tarsal tunnel syndrome. The symptoms were related to mechanical changes of the bony and soft tissue structures, leading to posterior impingement, and to neurovascular bundle entrapment at the tarsal tunnel, leading to tarsal tunnel syndrome.