Trapezoid
Trapezoid, also know as lesser multangular bone, is one of the carpal bones present in humans and other tetrapods. It is the smallest carpal among the distal row of carpals. It is a wedge shaped bone, the narrower end of which forms the palmar surface and broad end forms the dorsal surface.
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Trapezoid
STRUCTURE
Trapezoid bone has six surfaces (palmar, dorsal, superior, inferior, lateral and medial). Out of these surfaces, 4 are articulating. The detail of these surfaces is as follows:
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Superior surface is a quadrilateral shaped, concave surface meant for articulating with scaphoid.
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Inferior surface makes a joint with the proximal end of second metacarpal bone.
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Lateral surface is a smooth, convex surface and it makes an articulation with Trapezium bone.
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Medial surface is smooth in the front because of its attachment with the Capitate bone, while the back of this surface is rough due to the attachment of interosseous ligaments.
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Palmar and dorsal surfaces are non-articular and rough due to the attachment of ligaments.
FUNCTION
Along with other carpal bones this bone functions to form the structure of wrist.
CLINICAL ASPECTS
It is the least likely of all carpal bones to get fractured and isolated trapezoid fractures are extremely rare.
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