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Posterior Ankle Impingement Syndrome: Symptoms, Causes, and Treatments

Source: Verywell Health

Posterior ankle impingement syndrome (PAIS) is a condition that causes deep pain in the back of the ankle when the foot is pointed downward (plantar flexed). This problem typically arises when a piece of excess bone, a muscle, or a ligament pinches against another anatomical structure in the hindfoot.

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