Trapezoid

Os trapezoideum

SkeletalSkeletonArmLeft and right

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What it is

Small wedge-shaped distal-row bone at the base of the index metacarpal.

Function

Distal-row carpal: forms a rigid unit with the metacarpals and transmits grip forces to the forearm.

Size

≈ 10 × 12 × 12 mm

Clinical note

The least commonly fractured carpal bone.