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The Trapezoid Bone

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Anna Southwick

on 3 September 2014

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Transcript of The Trapezoid Bone

The trapezoid does not really have a function by itself but the carpals as a whole (which includes the trapezoid bone) give a bony superstructure to the hand. A superstructure is something built on top of something else.
The Trapezoid Bone
The trapezoid bone is in the hand
It is a carpal bone
It is located beneath the second metacarpal
The trapezoid bone is located near the wrist. There are not many muscles running over the area where this bone is located. There are many tendons and ligaments though. Some of the main ones are the palmar carpal ligament, tendons of extensor digitorum and the extensor retinaculum
Adjoining Muscles
If you are looking at a left hand from the top, the trapezium is to the right of the trapezoid bone. The capitate would be to the left. The scaphoid is below it and the trapezium to the right.
The trapezoid bone forms a firm fairly stationary joint with the second metacarpal base.
Adjoining Joints and Bones
The trapezoid bone is the least likely carpal bone to get injured. This is because the shape of the bone puts it in a very sheltered spot and ligaments hold it tightly into its place.
One way it can get injured though is when there is axial force when the trapezoid bone is applied to the second metacarpal. Axial force is when force is applied directly to the center axis of something. This can fracture the trapezoid bone but is very rare.
People who injure this bone will complain about pain at the base of their second metacarpal. You may see swelling in the wrist and a decreased range in motion
Theses injuries occur so infrequently there is not a standard treatment.
Occasionally the doctor will remove a small piece of this bone.
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