Os intermetatarseum
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The os intermetatarseum is an uncommon accessory ossicle of the foot occurring in ~4% (range 1-7%) of the population.
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:
- itit 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:
- itit forms a spur that is seen as a bony projection in the first and second intermetatarsal space
-<strong>free standing</strong> - it is a completely independent ossicle, and it does not show any osseous or articular connection with any structure</li>- +<strong>free standing:</strong> it is a completely independent ossicle, and it does not show any osseous or articular connection with any structure</li>
-<strong>articulating</strong> - it may form a synovial joint with first or second metatarsal or the <a href="/articles/medial-cuneiform-bone">medial cuneiform</a>- +<strong>articulating: </strong>it may form a synovial joint with first or second metatarsal or the <a href="/articles/medial-cuneiform-bone">medial cuneiform</a>
-<strong>fused</strong> - it forms a spur that is seen as a bony projection in the first and second intermetatarsal space</li>- +<strong>fused:</strong> it forms a spur that is seen as a bony projection in the first and second intermetatarsal space</li>