Key points about an accessory navicular bone
- An accessory navicular bone is an extra bone found on the inner side of the foot.
- It’s present at birth but may not cause symptoms until adolescence or after injury.
- Pain typically occurs with overuse, trauma or pressure from shoes.
- Conservative treatment is usually effective, but surgery may be needed in chronic cases.
- Custom orthotics and physical therapy can help manage discomfort and prevent flare-ups.
Accessory navicular bone causes
The accessory navicular bone is present at birth and is usually not painful. When pain occurs, it’s because of:
- Congenital presence of an extra bone
- Irritation from overuse or repeated stress
- Trauma or injury to the foot
- Tight or ill-fitting shoes rubbing against the bony area
- Pulling from a tendon during physical activity
Accessory navicular bone risk factors
There are a few factors that cause a higher risk of having pain for the accessory bone, including:
- Being an adolescent (especially during growth spurts)
- Having flat feet or poor foot alignment
- Playing high-impact sports (like running, dancing or soccer)
- Wearing rigid or unsupportive footwear
- Having a family history of accessory navicular
Accessory navicular bone symptoms
Symptoms may be caused by:
- Pain on the inner arch or side of the foot
- Swelling, redness or tenderness over the navicular area
- A bony bump visible or felt above the arch
- Pain that worsens with activity or shoe pressure
- Trouble walking or performing athletic movements
Accessory navicular bone diagnosis
If you think you may have an accessory navicular bone, your doctor may perform:
- A physical exam focusing on tenderness, swelling and structure
- X-rays to confirm the presence and position of the accessory bone
- An MRI or bone scan in complex or unclear cases
- An evaluation of arch structure and tendon function
Accessory navicular bone treatment
Treating the symptoms of an accessory navicular bone may look like:
- Rest, ice and anti-inflammatory medications
- Immobilization with a walking boot or cast
- Custom orthotics to support the arch and reduce pressure
- Physical therapy to strengthen supporting muscles
- Surgery in cases of chronic pain or failed conservative treatment
When to Seek Care
- Ongoing or worsening pain along the inner arch
- Difficulty with walking, sports or shoe comfort
- Swelling or a painful bump on the side of the foot
- Pain that doesn't improve with rest and supportive footwear
- History of foot trauma followed by persistent symptoms