Accessory Navicular Bone
Original Editors - Carlos De Coster
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Search Strategy[edit | edit source]
PubMed (http://www.ncbi.nlm.nih.gov/pubmed)
MeSH terms:
• Complications
• Diagnosis
• Drug therapy
• Epidemiology
• Etiology
• Pathology
• Rehabilitation
• Surgery
• Therapy
Medline Plus
Used keyword:
• Accesory navicular bone
• Os tibiale externum
Definition/Description[edit | edit source]
The accessory navicular or os tibiale externum is often erroneously considered as a normal anatomic and roentgenographic.
It is the most common ossicle in the foot. [1] Most commonly it occurs bilateral.[2]
We can distinct three types of accessory navicular bone:
1) A small round separate ossicle imbedded within the posterior tibial tendon.
2) A larger, triangular ossification centre adjacent to the navicular tuberosity and connected by a synchondrosis.
3) An enlarged medial horn of the navicular itself, called a cornuate navicular.
These three types have a collective incidence of 4 to 21% [3] The type 2 and 3 variants have been associated with pathologic conditions such as posterior tibial tendon tear and accessory navicular bone [3]
Clinically Relevant Anatomy[edit | edit source]
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Epidemiology /Etiology[edit | edit source]
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