Os tibiale externum

Case contributed by Dr Varun Babu

Presentation

Pain along the medial arch of foot

Patient Data

Age: 30 years
Gender: Male
MRI

Accessory navicular bone with mild os- navicular articular edema. Mild intratendinous edema in tibialis posterior as it inserts into the os. 

Case Discussion

Accessory navicular bone can be totally asymptomatic or at time cause some amount of friction with the navicular articulation resulting in focal marrow edema and secondary foot pain as in this case. Patient was treated conservatively. 

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