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Os Tibiale Externum

Os Tibiale Externum | Mint Foot Care

It is an accessory navicular bone or an extra piece of cartilage located next to the navicular bone in the inner (medial) arch of the foot. It is present at birth but not part of the normal bone structure.

It is present in 10-15% of the population with no symptoms. Often, people with this condition are unaware of it as it causes no problem. However, some may develop a painful condition, characterised by swelling and pain over the bone along the inner arch of the foot, flat feet and difficulty finding comfortable footwear due to the bone rubbing against the shoe. It is most common in females aged 10 to 20 years.

Common signs and symptoms:

  • A bony growth or bump on the arch
  • Throbbing or pain along the arch of the foot during or after stressful exercise or activity
  • Swelling, warmth or redness in the midfoot

Some of the common causes for this condition can be:

  • An injury to the foot or ankle structures
  • Irritation from footwear
  • Overpronation

Os Tibiale Externum Diagnosis and Treatment at Mint Footcare

At Mint Foot Care our podiatrists diagnose this condition by physical examination, thorough history and X-ray.


Conservative treatment for Accessory Navicular Syndrome is most common, surgery or more intense forms of treatment may be necessary if nonsurgical care fails or consistent pain continues. Conservative treatment can consist of:

  • Icing and rest
  • Immobilisation with a CAM walker
  • Non-steroidal anti-inflammatory medication
  • Orthotics
  • Exercises or light activity to strengthen


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