Accessory bones of the ankle are thought to be caused by abnormal development of the cartilage. This can happen due to genetic factors, trauma, or inflammation.
Accessory bones of the ankle are relatively common congenital anomalies that occur when the foot is developing in the womb. They are believed to develop due to an abnormal fusion of the cartilage that forms the tarsal bones.
They can range in size from very small to several centimeters in length and usually have no associated symptoms.
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