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Genetic and Rare Diseases Information Center (GARD)

Accessory navicular bone


* Not a rare disease

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Your Question

I have accessory navicular bone and the condition is causing me considerable pain. How is this condition treated?

Our Answer

We have identified the following information that we hope you find helpful. If you still have questions, please contact us.

What is the accessory navicular bone?

An accessory navicular bone is a small bone located in the middle of the foot. It is near the navicular bone, the bone that goes across the foot near the instep. It is a common trait, estimated to be in approximately 2 to 12% of the general population and up to 14% of children. This bone may develop a bump that can cause irritation, swelling, and pain.[1] Click here to view a diagram of the foot.
Last updated: 5/27/2009

What are the symptoms of an accessory navicular bone?

Accessory navicular bone may cause no symptoms, but in some cases causes pain, tenderness, or irritation on or around the top of the instep. It may also cause the foot to be abnormally positioned, and may limit the normal motion of the foot. Symptoms may worsen with increased activity or tight shoes.[1]
Last updated: 5/27/2009

How might accessory navicular bone be treated?

If the accessory navicular bone is causing symptoms, activities may be restricted and a softer shoe may be recommended until the symptoms go away. If the symptoms persist a specially and carefully made shoe support may be tried. In children the condition usually resolves once the child stops growing. For people with accessory navicular bone who experience severe symptoms surgery may be considered to remove the bony growth. Other treatments may include non-steroidal anti-inflammatories (NSAIDs) such as ibuprofen, placing a doughnut-shaped piece of moleskin around the affected area to relieve pain and tenderness, or immobilizing the area with a cast for six weeks.[1]
Last updated: 5/27/2009

What causes of accessory navicular bone?

The cause of accessory navicular bone is unknown. In some cases, the condition may be related to the development of flatfoot also known as pes planus, in other cases it may be related to repeated foot and ankle sprains.[1]
Last updated: 5/27/2009

What does it mean to have a flat foot?

Flat feet are a common condition. In infants and toddlers, the arch is not developed and flat feet are normal. The arch develops in childhood. By adulthood, most people have developed normal arches. When flat feet persist, most are considered variations of normal. Most feet are flexible and an arch appears when the person stands on his or her toes. Adults can develop a flat foot when they are 60-70 years old. This type of flat foot is usually on one side. Foot pain, ankle pain, or lower leg pain (especially in children) may be a result of flat feet and should be evaluated by a health care provider.[2]
Last updated: 5/27/2009

See Disclaimer regarding information on this site. Some links on this page may take you to organizations outside of the National Institutes of Health.