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Posterior Impingement Syndrome of the ankle is an occasional cause of pain at the back of the ankle in patients such as ballet dancers and footballers who have to forcibly plantar flex their foot. The pain is due to crushing of the soft tissue at the back of the ankle, and usually there is an enlarged posterior tubercle of the talus present or else an os trigonum. When the condition is remembered, It is easy to diagnose, and removal of the excess bone brings about rapid relief.
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Ronald Quirk (1991) studied this question.
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