A Haglund’s Deformity happens when the Achilles tendon becomes irritated at the point where it attaches to the calcaneus (heel bone). It results in a bony enlargement at the back of the foot, causing sharp pain in the heel. The enlargement gradually leads to retrocalcaneal bursitis, which can become very painful. The area rubs on the stiff back of shoes, creating pressure and irritating that part of the heel. It should initially be given medical treatment, but if that fails then surgery is an option.
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