Adult-acquired flatfoot deformity following posterior tibialis to dorsum transfer: a case report.

A previous study showed that flatfoot deformity does not develop after posterior tibialis to dorsum transfer in patients with peroneal nerve palsy. Their conclusion was that it is the unopposed pull of the peroneus brevis which leads to the flatfoot deformity in posterior tibial tendon dysfunction. This case report presents a patient who developed a flatfoot deformity after posterior tibialis to dorsum transfer despite nonfunctioning peroneal muscles.