The accessory triangular bone is found in 7-25% of people and is located at the back of the talus. In most cases, its presence does not cause any discomfort. In athletes who perform repeated plantar flexion movements (such as ballerinas who climb toes), the triangular ankle may be irritated as manifested by overload pain at the back of the ankle.

An additional navicular bone lies on the medial side of the tarsus. The pain is exacerbated by the conflict between the protruding ankle and the upper of the shoes. In the case of a flat valgus foot, the discomforts can be alleviated by using an insole correcting the incorrect position of the foot. Failure to achieve the desired effect may be an indication for the surgical removal of the additional navicular bone.

Surgical excision of the accessory ankle is performed in the event of an acute injury that resulted in a fracture of the accessory ankle. Surgical treatment also includes conditions where medical treatment has not been successful.