In a nutshell
An accessory navicular lies on the inner side of the foot near the normal navicular bone. Many people never notice it; others have a small prominence there. The area may hurt only when shoes press on it or load irritates the tissue.
Why does it happen?
The variation arises from an additional ossification center near the navicular bone. Its relationship to the posterior tibial tendon and a possible cartilage connection influence whether pulling and pressure cause symptoms.
Frequency
An accessory navicular is found incidentally in some people. Frequency estimates depend on the population and imaging; only some findings cause symptoms.
Frequency is a qualitative description, not your individual probability.
Is it normal?
An extra bone without symptoms is often an incidental finding.
When to seek advice
Persistent pressure pain, swelling, or trouble bearing weight should be assessed by an orthopedist; an injury must be ruled out after an accident.
Does this happen to you?
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Sources (2)
- Xiang et al.: Accessory navicular in children (opens a new tab)
Developmental variation of the ossification center and clinical symptoms.
- Hospital for Sick Children: Accessory navicular (opens a new tab)
Location, tendon relation, usually absent symptoms, and irritation from load.
Editorial update: . AI-assisted research and editing; not individually reviewed by a physician. How we research
