Os
Naviculare/Os Tibiale Externum - Presents medial to
the navicular tuberosity; it is a sesamoid that lies within
the tibialis posterior tendon
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Os
Naviculare/Os Tibiale Externum - another example.
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Os
Peroneum - a sesamoid which lies within the tendon
of peroneus longus/brevis; it articulates with the plantar
lateral aspect of the cuboid
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Os
Trigonum - presents on the posterior aspect of the
talus and occurs when the lateral tubercle is separate
to the body of the talus; can become enlarged and is known
as 'Steida's process'. It is often hard to distinguish
from a fracture of the posterior lateral tubercle of the
talus.
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Os
Intermetatarseum - a very common ossicle found at
any or all of the lateral metatarsal heads. However, this
generally refers to a sesamoid (atavistic metatarsal)
between the first and second metatarsals proximally. The
site on radiograph has also been described as os intermetatseum,
but this should not be misinterpreted as the above, which
is the classic description.
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Os
Interphalangeum of Hallux - sesamoid within the Flexor
Hallucis Longus tendon located below the inter-phalangeal
joint of the hallux
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NOTE:
Accessory bones can be located at various other sites including
the medial and lateral malleoli and the base of the fifth
metatatarsal.
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