Os intermetatarseum
Last revised by Mohammad Taghi Niknejad on 9 Nov 2023
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Knipe H, Niknejad M, Worsley C, et al. Os intermetatarseum. Reference article, Radiopaedia.org (Accessed on 09 Dec 2023) https://doi.org/10.53347/rID-25565
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25565
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At the time the article was created Henry Knipe had no recorded disclosures.
View Henry Knipe's current disclosuresLast revised:
9 Nov 2023, Mohammad Taghi Niknejad ◉
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At the time the article was last revised Mohammad Taghi Niknejad had no financial relationships to ineligible companies to disclose.
View Mohammad Taghi Niknejad's current disclosuresRevisions:
13 times, by 9 contributors - see full revision history and disclosures
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The os intermetatarseum is an uncommon accessory ossicle of the foot occurring in ~4% (range 1-7%) of the population.
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Clinical presentation
It is usually asymptomatic and an incidental finding although it can be a cause of dorsal midfoot pain.
Gross anatomy
The os intermetarseum is typically positioned dorsally between the bases of the first and second metatarsals but has been reported to occur near the metatarsal heads or between the fourth and fifth metatarsal bases. It can have a variety of shapes:
- round
- oval
- bean-shaped
- linear
- resemble a rudimentary metatarsal
Classification
It can be classified into three basic types:
- free standing: it is a completely independent ossicle, and it does not show any osseous or articular connection with any structure
- articulating: it may form a synovial joint with first or second metatarsal or the medial cuneiform
- fused: it forms a spur that is seen as a bony projection in the first and second intermetatarsal space
References
- 1. Delaon PJ. Os intermetarseum: unusual variant. Radiology. 1941;37:102-103.
- 2. Kalantari BN, Seeger LL, Motamedi K, Chow K. Accessory ossicles and sesamoid bones: Spectrum of pathology and imaging evaluation. Applied Radiology. 2007;36:28-37.
- 3. Nwawka O, Hayashi D, Diaz L et al. Sesamoids and Accessory Ossicles of the Foot: Anatomical Variability and Related Pathology. Insights Imaging. 2013;4(5):581-93. doi:10.1007/s13244-013-0277-1 - Pubmed
- 4. Birrer RB, Griesemer B, Cataletto MB. Pediatric Sports Medicine for Primary Care. (2002) ISBN: 0781731593 - Google Books
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