The enigmatic diagnosis of posterior tibialis tendon rupture.

Posterior tibialis tendon rupture is a diagnosis that is often missed. This is thought to be secondary to nonspecific clinical findings and the lack of any laboratory or radiographic test to reliably confirm the diagnosis. We report sixteen cases of surgically confirmed posterior tibialis tendon rupture. Based on our review of these patients, the diagnosis of posterior tibialis tendon rupture should be strongly suspected in the adult patient presenting with a history of a twisting ankle injury and generalized medial ankle pain and swelling. A flexible, asymmetric pes planus and forefoot pronation deformity with absence of posterior tibialis tendon function on manual testing is seen on examination. This is associated with loss of ipsilateral heel inversion on bilateral heel rise. The patient is usually unable to perform ipsilateral single leg heel rise and has less severe pes planus of the contralateral foot. This study reviews the presentation, pathophysiology, diagnosis, and treatment of posterior tibialis tendon rupture.