Os subtibiale is a rare accessory ossicle of the ankle, considered not of clinical significance. But its presence in trauma patients may cause misdiagnosis as malleolar fracture and over-treatment. Because the ossicle is attached to the deltoid ligament, ankle trauma that cause medial compartment injury may detach os subtibiale from medial malleolus. In these situations, MR imaging may help to diagnose the deltoid injury, demonstrate the features of the ossicle, and guide treatment.

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http://dx.doi.org/10.7547/23-059DOI Listing

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Os subtibiale is a rare accessory ossicle of the ankle, considered not of clinical significance. But its presence in trauma patients may cause misdiagnosis as malleolar fracture and over-treatment. Because the ossicle is attached to the deltoid ligament, ankle trauma that cause medial compartment injury may detach os subtibiale from medial malleolus.

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Extra Ossification Center at the Tip of the Medial Malleolus Suspected as Fracture: A Clinical Clue.

J Foot Ankle Surg

December 2016

Orthopedist, Department of Orthopedics and Traumatology, Near East University Medical Faculty, Lefkoşa, Cyprus. Electronic address:

The appearance of displaced bone inferior (distal) to the medial malleolus, present on radiographs in an adolescent patient, can be confused with a fracture, when, in fact, it is the radiographic appearance of a secondary center of ossification. Foot and ankle surgeons should be aware of extra ossification centers and accessory bones, including one at the tip of the medial malleolus, to avoid misdiagnosis and overtreatment. In the present report, I describe the case of a 9-year-old male with bilateral extra ossification centers at the tip of each medial malleolus.

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