Haglund’s deformity is a bony enlargement on the back of the heel. The soft tissue near the Achilles tendon becomes irritated when the bony enlargement rubs against shoes. This often leads to painful bursitis, which is an inflammation of the bursa (a fluid-filled sac between the tendon and bone).
Haglund’s deformity is often called “pump bump” because the rigid backs of pump-style shoes can create pressure that aggravates the enlargement when walking. In fact, any shoes with a rigid back, such as ice skates, men’s dress shoes, or women’s pumps, can cause this irritation.
To some extent, heredity plays a role in Haglund’s deformity. Inherited foot structures that can make one prone to developing this condition include:
- A high-arched foot
- A tight Achilles tendon
- A tendency to walk on the outside of the heel.