Os Subfibulare

Description

An os subfibulare (a) Anteroposterior foot radiograph, the white arrow is os subfibulare (b) 3D computed tomography (CT) appearance

(a) Os subfibulare and (b) os subtibiale. Black arrows indicate the accessory ossicles. F, fibula; T, talus; Ti, tibia.

Name

• Os Subfibulare

General

• Accessory ossicle that lies at the tip of the lateral malleolus of the ankle joint
• Rarely reported in the literature
• One of the accessory bones of the foot and ankle

Clinical Presentation

• Typically asymptomatic and incidental finding
• Can cause pain or degenerative changes

Etiology

• Theory 1: avulsion fracture attributable to the anterior talofibular ligament
• Theory 2: unfused secondary ossification center
• Generally thought to be post-traumatic rather than congenital

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Clinical Significance

• Needs to be updated

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See Also

• Ankle Anatomy Main
• Accessory Bones Main
• Radiology Main

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