Trapezium
Os trapezium
SkeletalSkeletonArmLeft and right
View left in 3D View right in 3D
- What it is
- Distal-row bone at the base of the thumb with a saddle-shaped joint for the first metacarpal.
- Function
- Distal-row carpal: forms a rigid unit with the metacarpals and transmits grip forces to the forearm.
- Size
- ≈ 13 × 12 × 12 mm
- Clinical note
- Its saddle joint gives the thumb opposition; it is a common site of osteoarthritis.