Understanding Haglund's Deformity and Heel Pump Bumps
Podiatry Guide
What Is a Pump Bump and How Does Foot Mechanics Cause It?
A bump on the back of your heel—often called a pump bump, Haglund's deformity, or retrocalcaneal exostosis—is a bony prominence located on the outer back corner of the heel bone (calcaneus).
While it is frequently associated with tight-fitting shoes or stiff heel counters, the underlying cause often comes down to your foot's natural motion when walking.
How Pronation Drives Heel Enlargement
When your foot rolls inward excessively (overpronation) during the gait cycle, it increases strain on the outer edge of the Achilles tendon where it attaches to the calcaneus. Over time, this repetitive traction and uneven mechanical pressure cause the heel bone to thicken and hypertrophy. Slow-motion gait analysis clearly shows how the heel tilts relative to the lower leg, pulling awkwardly on the tendon insertion with every step.
The Role of Footwear and Friction
Once the bony prominence forms, stiff footwear collar backing rubs against the enlarged area. This friction causes localized inflammation, swelling, and sharp pain. Managing this condition involves both controlling excessive foot pronation to reduce strain on the Achilles tendon and choosing footwear with soft, supportive heel counters that won't dig into the back of your foot.
Key Factors in Managing Haglund's Deformity
- Address foot pronation with supportive arch support or orthotic insoles.
- Choose shoes with soft or padded heel counters to reduce direct pressure.
- Avoid footwear with rigid, pressing back collars that irritate the heel.
- Consult a podiatrist if heel pain persists or limits your daily movement.
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Shop Orthotic InsolesThis article is for informational purposes only and does not replace professional medical advice, diagnosis, or treatment. Always consult a qualified podiatrist or healthcare professional regarding foot pain or medical conditions.